File: D:/HostingSpaces/SBogers10/bomacon.komma.pro/node_modules/ramda/dist/ramda.js
// Ramda v0.24.1
// https://github.com/ramda/ramda
// (c) 2013-2017 Scott Sauyet, Michael Hurley, and David Chambers
// Ramda may be freely distributed under the MIT license.
;(function() {
'use strict';
/**
* A special placeholder value used to specify "gaps" within curried functions,
* allowing partial application of any combination of arguments, regardless of
* their positions.
*
* If `g` is a curried ternary function and `_` is `R.__`, the following are
* equivalent:
*
* - `g(1, 2, 3)`
* - `g(_, 2, 3)(1)`
* - `g(_, _, 3)(1)(2)`
* - `g(_, _, 3)(1, 2)`
* - `g(_, 2, _)(1, 3)`
* - `g(_, 2)(1)(3)`
* - `g(_, 2)(1, 3)`
* - `g(_, 2)(_, 3)(1)`
*
* @constant
* @memberOf R
* @since v0.6.0
* @category Function
* @example
*
* var greet = R.replace('{name}', R.__, 'Hello, {name}!');
* greet('Alice'); //=> 'Hello, Alice!'
*/
var __ = { '@@functional/placeholder': true };
var _aperture = function _aperture(n, list) {
var idx = 0;
var limit = list.length - (n - 1);
var acc = new Array(limit >= 0 ? limit : 0);
while (idx < limit) {
acc[idx] = Array.prototype.slice.call(list, idx, idx + n);
idx += 1;
}
return acc;
};
/* eslint-disable no-unused-vars */
var _arity = function _arity(n, fn) {
/* eslint-disable no-unused-vars */
switch (n) {
case 0:
return function () {
return fn.apply(this, arguments);
};
case 1:
return function (a0) {
return fn.apply(this, arguments);
};
case 2:
return function (a0, a1) {
return fn.apply(this, arguments);
};
case 3:
return function (a0, a1, a2) {
return fn.apply(this, arguments);
};
case 4:
return function (a0, a1, a2, a3) {
return fn.apply(this, arguments);
};
case 5:
return function (a0, a1, a2, a3, a4) {
return fn.apply(this, arguments);
};
case 6:
return function (a0, a1, a2, a3, a4, a5) {
return fn.apply(this, arguments);
};
case 7:
return function (a0, a1, a2, a3, a4, a5, a6) {
return fn.apply(this, arguments);
};
case 8:
return function (a0, a1, a2, a3, a4, a5, a6, a7) {
return fn.apply(this, arguments);
};
case 9:
return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {
return fn.apply(this, arguments);
};
case 10:
return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {
return fn.apply(this, arguments);
};
default:
throw new Error('First argument to _arity must be a non-negative integer no greater than ten');
}
};
var _arrayFromIterator = function _arrayFromIterator(iter) {
var list = [];
var next;
while (!(next = iter.next()).done) {
list.push(next.value);
}
return list;
};
var _cloneRegExp = function _cloneRegExp(pattern) {
return new RegExp(pattern.source, (pattern.global ? 'g' : '') + (pattern.ignoreCase ? 'i' : '') + (pattern.multiline ? 'm' : '') + (pattern.sticky ? 'y' : '') + (pattern.unicode ? 'u' : ''));
};
var _complement = function _complement(f) {
return function () {
return !f.apply(this, arguments);
};
};
/**
* Private `concat` function to merge two array-like objects.
*
* @private
* @param {Array|Arguments} [set1=[]] An array-like object.
* @param {Array|Arguments} [set2=[]] An array-like object.
* @return {Array} A new, merged array.
* @example
*
* _concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
*/
var _concat = function _concat(set1, set2) {
set1 = set1 || [];
set2 = set2 || [];
var idx;
var len1 = set1.length;
var len2 = set2.length;
var result = [];
idx = 0;
while (idx < len1) {
result[result.length] = set1[idx];
idx += 1;
}
idx = 0;
while (idx < len2) {
result[result.length] = set2[idx];
idx += 1;
}
return result;
};
var _containsWith = function _containsWith(pred, x, list) {
var idx = 0;
var len = list.length;
while (idx < len) {
if (pred(x, list[idx])) {
return true;
}
idx += 1;
}
return false;
};
var _dropLastWhile = function dropLastWhile(pred, list) {
var idx = list.length - 1;
while (idx >= 0 && pred(list[idx])) {
idx -= 1;
}
return Array.prototype.slice.call(list, 0, idx + 1);
};
var _filter = function _filter(fn, list) {
var idx = 0;
var len = list.length;
var result = [];
while (idx < len) {
if (fn(list[idx])) {
result[result.length] = list[idx];
}
idx += 1;
}
return result;
};
var _forceReduced = function _forceReduced(x) {
return {
'@@transducer/value': x,
'@@transducer/reduced': true
};
};
// String(x => x) evaluates to "x => x", so the pattern may not match.
var _functionName = function _functionName(f) {
// String(x => x) evaluates to "x => x", so the pattern may not match.
var match = String(f).match(/^function (\w*)/);
return match == null ? '' : match[1];
};
var _has = function _has(prop, obj) {
return Object.prototype.hasOwnProperty.call(obj, prop);
};
var _identity = function _identity(x) {
return x;
};
var _isArguments = function () {
var toString = Object.prototype.toString;
return toString.call(arguments) === '[object Arguments]' ? function _isArguments(x) {
return toString.call(x) === '[object Arguments]';
} : function _isArguments(x) {
return _has('callee', x);
};
}();
/**
* Tests whether or not an object is an array.
*
* @private
* @param {*} val The object to test.
* @return {Boolean} `true` if `val` is an array, `false` otherwise.
* @example
*
* _isArray([]); //=> true
* _isArray(null); //=> false
* _isArray({}); //=> false
*/
var _isArray = Array.isArray || function _isArray(val) {
return val != null && val.length >= 0 && Object.prototype.toString.call(val) === '[object Array]';
};
var _isFunction = function _isFunction(x) {
return Object.prototype.toString.call(x) === '[object Function]';
};
/**
* Determine if the passed argument is an integer.
*
* @private
* @param {*} n
* @category Type
* @return {Boolean}
*/
var _isInteger = Number.isInteger || function _isInteger(n) {
return n << 0 === n;
};
var _isNumber = function _isNumber(x) {
return Object.prototype.toString.call(x) === '[object Number]';
};
var _isObject = function _isObject(x) {
return Object.prototype.toString.call(x) === '[object Object]';
};
var _isPlaceholder = function _isPlaceholder(a) {
return a != null && typeof a === 'object' && a['@@functional/placeholder'] === true;
};
var _isRegExp = function _isRegExp(x) {
return Object.prototype.toString.call(x) === '[object RegExp]';
};
var _isString = function _isString(x) {
return Object.prototype.toString.call(x) === '[object String]';
};
var _isTransformer = function _isTransformer(obj) {
return typeof obj['@@transducer/step'] === 'function';
};
var _map = function _map(fn, functor) {
var idx = 0;
var len = functor.length;
var result = Array(len);
while (idx < len) {
result[idx] = fn(functor[idx]);
idx += 1;
}
return result;
};
// Based on https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
var _objectAssign = function _objectAssign(target) {
if (target == null) {
throw new TypeError('Cannot convert undefined or null to object');
}
var output = Object(target);
var idx = 1;
var length = arguments.length;
while (idx < length) {
var source = arguments[idx];
if (source != null) {
for (var nextKey in source) {
if (_has(nextKey, source)) {
output[nextKey] = source[nextKey];
}
}
}
idx += 1;
}
return output;
};
var _of = function _of(x) {
return [x];
};
var _pipe = function _pipe(f, g) {
return function () {
return g.call(this, f.apply(this, arguments));
};
};
var _pipeP = function _pipeP(f, g) {
return function () {
var ctx = this;
return f.apply(ctx, arguments).then(function (x) {
return g.call(ctx, x);
});
};
};
// \b matches word boundary; [\b] matches backspace
var _quote = function _quote(s) {
var escaped = s.replace(/\\/g, '\\\\').replace(/[\b]/g, '\\b') // \b matches word boundary; [\b] matches backspace
.replace(/\f/g, '\\f').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/\t/g, '\\t').replace(/\v/g, '\\v').replace(/\0/g, '\\0');
return '"' + escaped.replace(/"/g, '\\"') + '"';
};
var _reduced = function _reduced(x) {
return x && x['@@transducer/reduced'] ? x : {
'@@transducer/value': x,
'@@transducer/reduced': true
};
};
/**
* Polyfill from <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString>.
*/
var _toISOString = function () {
var pad = function pad(n) {
return (n < 10 ? '0' : '') + n;
};
return typeof Date.prototype.toISOString === 'function' ? function _toISOString(d) {
return d.toISOString();
} : function _toISOString(d) {
return d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) + 'T' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()) + '.' + (d.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) + 'Z';
};
}();
var _xfBase = {
init: function () {
return this.xf['@@transducer/init']();
},
result: function (result) {
return this.xf['@@transducer/result'](result);
}
};
var _xwrap = function () {
function XWrap(fn) {
this.f = fn;
}
XWrap.prototype['@@transducer/init'] = function () {
throw new Error('init not implemented on XWrap');
};
XWrap.prototype['@@transducer/result'] = function (acc) {
return acc;
};
XWrap.prototype['@@transducer/step'] = function (acc, x) {
return this.f(acc, x);
};
return function _xwrap(fn) {
return new XWrap(fn);
};
}();
var _assign = typeof Object.assign === 'function' ? Object.assign : _objectAssign;
/**
* This checks whether a function has a [methodname] function. If it isn't an
* array it will execute that function otherwise it will default to the ramda
* implementation.
*
* @private
* @param {Function} fn ramda implemtation
* @param {String} methodname property to check for a custom implementation
* @return {Object} Whatever the return value of the method is.
*/
var _checkForMethod = function _checkForMethod(methodname, fn) {
return function () {
var length = arguments.length;
if (length === 0) {
return fn();
}
var obj = arguments[length - 1];
return _isArray(obj) || typeof obj[methodname] !== 'function' ? fn.apply(this, arguments) : obj[methodname].apply(obj, Array.prototype.slice.call(arguments, 0, length - 1));
};
};
/**
* Optimized internal one-arity curry function.
*
* @private
* @category Function
* @param {Function} fn The function to curry.
* @return {Function} The curried function.
*/
var _curry1 = function _curry1(fn) {
return function f1(a) {
if (arguments.length === 0 || _isPlaceholder(a)) {
return f1;
} else {
return fn.apply(this, arguments);
}
};
};
/**
* Optimized internal two-arity curry function.
*
* @private
* @category Function
* @param {Function} fn The function to curry.
* @return {Function} The curried function.
*/
var _curry2 = function _curry2(fn) {
return function f2(a, b) {
switch (arguments.length) {
case 0:
return f2;
case 1:
return _isPlaceholder(a) ? f2 : _curry1(function (_b) {
return fn(a, _b);
});
default:
return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {
return fn(_a, b);
}) : _isPlaceholder(b) ? _curry1(function (_b) {
return fn(a, _b);
}) : fn(a, b);
}
};
};
/**
* Optimized internal three-arity curry function.
*
* @private
* @category Function
* @param {Function} fn The function to curry.
* @return {Function} The curried function.
*/
var _curry3 = function _curry3(fn) {
return function f3(a, b, c) {
switch (arguments.length) {
case 0:
return f3;
case 1:
return _isPlaceholder(a) ? f3 : _curry2(function (_b, _c) {
return fn(a, _b, _c);
});
case 2:
return _isPlaceholder(a) && _isPlaceholder(b) ? f3 : _isPlaceholder(a) ? _curry2(function (_a, _c) {
return fn(_a, b, _c);
}) : _isPlaceholder(b) ? _curry2(function (_b, _c) {
return fn(a, _b, _c);
}) : _curry1(function (_c) {
return fn(a, b, _c);
});
default:
return _isPlaceholder(a) && _isPlaceholder(b) && _isPlaceholder(c) ? f3 : _isPlaceholder(a) && _isPlaceholder(b) ? _curry2(function (_a, _b) {
return fn(_a, _b, c);
}) : _isPlaceholder(a) && _isPlaceholder(c) ? _curry2(function (_a, _c) {
return fn(_a, b, _c);
}) : _isPlaceholder(b) && _isPlaceholder(c) ? _curry2(function (_b, _c) {
return fn(a, _b, _c);
}) : _isPlaceholder(a) ? _curry1(function (_a) {
return fn(_a, b, c);
}) : _isPlaceholder(b) ? _curry1(function (_b) {
return fn(a, _b, c);
}) : _isPlaceholder(c) ? _curry1(function (_c) {
return fn(a, b, _c);
}) : fn(a, b, c);
}
};
};
/**
* Internal curryN function.
*
* @private
* @category Function
* @param {Number} length The arity of the curried function.
* @param {Array} received An array of arguments received thus far.
* @param {Function} fn The function to curry.
* @return {Function} The curried function.
*/
var _curryN = function _curryN(length, received, fn) {
return function () {
var combined = [];
var argsIdx = 0;
var left = length;
var combinedIdx = 0;
while (combinedIdx < received.length || argsIdx < arguments.length) {
var result;
if (combinedIdx < received.length && (!_isPlaceholder(received[combinedIdx]) || argsIdx >= arguments.length)) {
result = received[combinedIdx];
} else {
result = arguments[argsIdx];
argsIdx += 1;
}
combined[combinedIdx] = result;
if (!_isPlaceholder(result)) {
left -= 1;
}
combinedIdx += 1;
}
return left <= 0 ? fn.apply(this, combined) : _arity(left, _curryN(length, combined, fn));
};
};
/**
* Returns a function that dispatches with different strategies based on the
* object in list position (last argument). If it is an array, executes [fn].
* Otherwise, if it has a function with one of the given method names, it will
* execute that function (functor case). Otherwise, if it is a transformer,
* uses transducer [xf] to return a new transformer (transducer case).
* Otherwise, it will default to executing [fn].
*
* @private
* @param {Array} methodNames properties to check for a custom implementation
* @param {Function} xf transducer to initialize if object is transformer
* @param {Function} fn default ramda implementation
* @return {Function} A function that dispatches on object in list position
*/
var _dispatchable = function _dispatchable(methodNames, xf, fn) {
return function () {
if (arguments.length === 0) {
return fn();
}
var args = Array.prototype.slice.call(arguments, 0);
var obj = args.pop();
if (!_isArray(obj)) {
var idx = 0;
while (idx < methodNames.length) {
if (typeof obj[methodNames[idx]] === 'function') {
return obj[methodNames[idx]].apply(obj, args);
}
idx += 1;
}
if (_isTransformer(obj)) {
var transducer = xf.apply(null, args);
return transducer(obj);
}
}
return fn.apply(this, arguments);
};
};
/**
* Tests whether or not an object is similar to an array.
*
* @private
* @category Type
* @category List
* @sig * -> Boolean
* @param {*} x The object to test.
* @return {Boolean} `true` if `x` has a numeric length property and extreme indices defined; `false` otherwise.
* @example
*
* _isArrayLike([]); //=> true
* _isArrayLike(true); //=> false
* _isArrayLike({}); //=> false
* _isArrayLike({length: 10}); //=> false
* _isArrayLike({0: 'zero', 9: 'nine', length: 10}); //=> true
*/
var _isArrayLike = _curry1(function isArrayLike(x) {
if (_isArray(x)) {
return true;
}
if (!x) {
return false;
}
if (typeof x !== 'object') {
return false;
}
if (_isString(x)) {
return false;
}
if (x.nodeType === 1) {
return !!x.length;
}
if (x.length === 0) {
return true;
}
if (x.length > 0) {
return x.hasOwnProperty(0) && x.hasOwnProperty(x.length - 1);
}
return false;
});
/**
* `_makeFlat` is a helper function that returns a one-level or fully recursive
* function based on the flag passed in.
*
* @private
*/
var _makeFlat = function _makeFlat(recursive) {
return function flatt(list) {
var value, jlen, j;
var result = [];
var idx = 0;
var ilen = list.length;
while (idx < ilen) {
if (_isArrayLike(list[idx])) {
value = recursive ? flatt(list[idx]) : list[idx];
j = 0;
jlen = value.length;
while (j < jlen) {
result[result.length] = value[j];
j += 1;
}
} else {
result[result.length] = list[idx];
}
idx += 1;
}
return result;
};
};
var _xall = function () {
function XAll(f, xf) {
this.xf = xf;
this.f = f;
this.all = true;
}
XAll.prototype['@@transducer/init'] = _xfBase.init;
XAll.prototype['@@transducer/result'] = function (result) {
if (this.all) {
result = this.xf['@@transducer/step'](result, true);
}
return this.xf['@@transducer/result'](result);
};
XAll.prototype['@@transducer/step'] = function (result, input) {
if (!this.f(input)) {
this.all = false;
result = _reduced(this.xf['@@transducer/step'](result, false));
}
return result;
};
return _curry2(function _xall(f, xf) {
return new XAll(f, xf);
});
}();
var _xany = function () {
function XAny(f, xf) {
this.xf = xf;
this.f = f;
this.any = false;
}
XAny.prototype['@@transducer/init'] = _xfBase.init;
XAny.prototype['@@transducer/result'] = function (result) {
if (!this.any) {
result = this.xf['@@transducer/step'](result, false);
}
return this.xf['@@transducer/result'](result);
};
XAny.prototype['@@transducer/step'] = function (result, input) {
if (this.f(input)) {
this.any = true;
result = _reduced(this.xf['@@transducer/step'](result, true));
}
return result;
};
return _curry2(function _xany(f, xf) {
return new XAny(f, xf);
});
}();
var _xaperture = function () {
function XAperture(n, xf) {
this.xf = xf;
this.pos = 0;
this.full = false;
this.acc = new Array(n);
}
XAperture.prototype['@@transducer/init'] = _xfBase.init;
XAperture.prototype['@@transducer/result'] = function (result) {
this.acc = null;
return this.xf['@@transducer/result'](result);
};
XAperture.prototype['@@transducer/step'] = function (result, input) {
this.store(input);
return this.full ? this.xf['@@transducer/step'](result, this.getCopy()) : result;
};
XAperture.prototype.store = function (input) {
this.acc[this.pos] = input;
this.pos += 1;
if (this.pos === this.acc.length) {
this.pos = 0;
this.full = true;
}
};
XAperture.prototype.getCopy = function () {
return _concat(Array.prototype.slice.call(this.acc, this.pos), Array.prototype.slice.call(this.acc, 0, this.pos));
};
return _curry2(function _xaperture(n, xf) {
return new XAperture(n, xf);
});
}();
var _xdrop = function () {
function XDrop(n, xf) {
this.xf = xf;
this.n = n;
}
XDrop.prototype['@@transducer/init'] = _xfBase.init;
XDrop.prototype['@@transducer/result'] = _xfBase.result;
XDrop.prototype['@@transducer/step'] = function (result, input) {
if (this.n > 0) {
this.n -= 1;
return result;
}
return this.xf['@@transducer/step'](result, input);
};
return _curry2(function _xdrop(n, xf) {
return new XDrop(n, xf);
});
}();
var _xdropLast = function () {
function XDropLast(n, xf) {
this.xf = xf;
this.pos = 0;
this.full = false;
this.acc = new Array(n);
}
XDropLast.prototype['@@transducer/init'] = _xfBase.init;
XDropLast.prototype['@@transducer/result'] = function (result) {
this.acc = null;
return this.xf['@@transducer/result'](result);
};
XDropLast.prototype['@@transducer/step'] = function (result, input) {
if (this.full) {
result = this.xf['@@transducer/step'](result, this.acc[this.pos]);
}
this.store(input);
return result;
};
XDropLast.prototype.store = function (input) {
this.acc[this.pos] = input;
this.pos += 1;
if (this.pos === this.acc.length) {
this.pos = 0;
this.full = true;
}
};
return _curry2(function _xdropLast(n, xf) {
return new XDropLast(n, xf);
});
}();
var _xdropRepeatsWith = function () {
function XDropRepeatsWith(pred, xf) {
this.xf = xf;
this.pred = pred;
this.lastValue = undefined;
this.seenFirstValue = false;
}
XDropRepeatsWith.prototype['@@transducer/init'] = _xfBase.init;
XDropRepeatsWith.prototype['@@transducer/result'] = _xfBase.result;
XDropRepeatsWith.prototype['@@transducer/step'] = function (result, input) {
var sameAsLast = false;
if (!this.seenFirstValue) {
this.seenFirstValue = true;
} else if (this.pred(this.lastValue, input)) {
sameAsLast = true;
}
this.lastValue = input;
return sameAsLast ? result : this.xf['@@transducer/step'](result, input);
};
return _curry2(function _xdropRepeatsWith(pred, xf) {
return new XDropRepeatsWith(pred, xf);
});
}();
var _xdropWhile = function () {
function XDropWhile(f, xf) {
this.xf = xf;
this.f = f;
}
XDropWhile.prototype['@@transducer/init'] = _xfBase.init;
XDropWhile.prototype['@@transducer/result'] = _xfBase.result;
XDropWhile.prototype['@@transducer/step'] = function (result, input) {
if (this.f) {
if (this.f(input)) {
return result;
}
this.f = null;
}
return this.xf['@@transducer/step'](result, input);
};
return _curry2(function _xdropWhile(f, xf) {
return new XDropWhile(f, xf);
});
}();
var _xfilter = function () {
function XFilter(f, xf) {
this.xf = xf;
this.f = f;
}
XFilter.prototype['@@transducer/init'] = _xfBase.init;
XFilter.prototype['@@transducer/result'] = _xfBase.result;
XFilter.prototype['@@transducer/step'] = function (result, input) {
return this.f(input) ? this.xf['@@transducer/step'](result, input) : result;
};
return _curry2(function _xfilter(f, xf) {
return new XFilter(f, xf);
});
}();
var _xfind = function () {
function XFind(f, xf) {
this.xf = xf;
this.f = f;
this.found = false;
}
XFind.prototype['@@transducer/init'] = _xfBase.init;
XFind.prototype['@@transducer/result'] = function (result) {
if (!this.found) {
result = this.xf['@@transducer/step'](result, void 0);
}
return this.xf['@@transducer/result'](result);
};
XFind.prototype['@@transducer/step'] = function (result, input) {
if (this.f(input)) {
this.found = true;
result = _reduced(this.xf['@@transducer/step'](result, input));
}
return result;
};
return _curry2(function _xfind(f, xf) {
return new XFind(f, xf);
});
}();
var _xfindIndex = function () {
function XFindIndex(f, xf) {
this.xf = xf;
this.f = f;
this.idx = -1;
this.found = false;
}
XFindIndex.prototype['@@transducer/init'] = _xfBase.init;
XFindIndex.prototype['@@transducer/result'] = function (result) {
if (!this.found) {
result = this.xf['@@transducer/step'](result, -1);
}
return this.xf['@@transducer/result'](result);
};
XFindIndex.prototype['@@transducer/step'] = function (result, input) {
this.idx += 1;
if (this.f(input)) {
this.found = true;
result = _reduced(this.xf['@@transducer/step'](result, this.idx));
}
return result;
};
return _curry2(function _xfindIndex(f, xf) {
return new XFindIndex(f, xf);
});
}();
var _xfindLast = function () {
function XFindLast(f, xf) {
this.xf = xf;
this.f = f;
}
XFindLast.prototype['@@transducer/init'] = _xfBase.init;
XFindLast.prototype['@@transducer/result'] = function (result) {
return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.last));
};
XFindLast.prototype['@@transducer/step'] = function (result, input) {
if (this.f(input)) {
this.last = input;
}
return result;
};
return _curry2(function _xfindLast(f, xf) {
return new XFindLast(f, xf);
});
}();
var _xfindLastIndex = function () {
function XFindLastIndex(f, xf) {
this.xf = xf;
this.f = f;
this.idx = -1;
this.lastIdx = -1;
}
XFindLastIndex.prototype['@@transducer/init'] = _xfBase.init;
XFindLastIndex.prototype['@@transducer/result'] = function (result) {
return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.lastIdx));
};
XFindLastIndex.prototype['@@transducer/step'] = function (result, input) {
this.idx += 1;
if (this.f(input)) {
this.lastIdx = this.idx;
}
return result;
};
return _curry2(function _xfindLastIndex(f, xf) {
return new XFindLastIndex(f, xf);
});
}();
var _xmap = function () {
function XMap(f, xf) {
this.xf = xf;
this.f = f;
}
XMap.prototype['@@transducer/init'] = _xfBase.init;
XMap.prototype['@@transducer/result'] = _xfBase.result;
XMap.prototype['@@transducer/step'] = function (result, input) {
return this.xf['@@transducer/step'](result, this.f(input));
};
return _curry2(function _xmap(f, xf) {
return new XMap(f, xf);
});
}();
var _xreduceBy = function () {
function XReduceBy(valueFn, valueAcc, keyFn, xf) {
this.valueFn = valueFn;
this.valueAcc = valueAcc;
this.keyFn = keyFn;
this.xf = xf;
this.inputs = {};
}
XReduceBy.prototype['@@transducer/init'] = _xfBase.init;
XReduceBy.prototype['@@transducer/result'] = function (result) {
var key;
for (key in this.inputs) {
if (_has(key, this.inputs)) {
result = this.xf['@@transducer/step'](result, this.inputs[key]);
if (result['@@transducer/reduced']) {
result = result['@@transducer/value'];
break;
}
}
}
this.inputs = null;
return this.xf['@@transducer/result'](result);
};
XReduceBy.prototype['@@transducer/step'] = function (result, input) {
var key = this.keyFn(input);
this.inputs[key] = this.inputs[key] || [
key,
this.valueAcc
];
this.inputs[key][1] = this.valueFn(this.inputs[key][1], input);
return result;
};
return _curryN(4, [], function _xreduceBy(valueFn, valueAcc, keyFn, xf) {
return new XReduceBy(valueFn, valueAcc, keyFn, xf);
});
}();
var _xtake = function () {
function XTake(n, xf) {
this.xf = xf;
this.n = n;
this.i = 0;
}
XTake.prototype['@@transducer/init'] = _xfBase.init;
XTake.prototype['@@transducer/result'] = _xfBase.result;
XTake.prototype['@@transducer/step'] = function (result, input) {
this.i += 1;
var ret = this.n === 0 ? result : this.xf['@@transducer/step'](result, input);
return this.n >= 0 && this.i >= this.n ? _reduced(ret) : ret;
};
return _curry2(function _xtake(n, xf) {
return new XTake(n, xf);
});
}();
var _xtakeWhile = function () {
function XTakeWhile(f, xf) {
this.xf = xf;
this.f = f;
}
XTakeWhile.prototype['@@transducer/init'] = _xfBase.init;
XTakeWhile.prototype['@@transducer/result'] = _xfBase.result;
XTakeWhile.prototype['@@transducer/step'] = function (result, input) {
return this.f(input) ? this.xf['@@transducer/step'](result, input) : _reduced(result);
};
return _curry2(function _xtakeWhile(f, xf) {
return new XTakeWhile(f, xf);
});
}();
/**
* Adds two values.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig Number -> Number -> Number
* @param {Number} a
* @param {Number} b
* @return {Number}
* @see R.subtract
* @example
*
* R.add(2, 3); //=> 5
* R.add(7)(10); //=> 17
*/
var add = _curry2(function add(a, b) {
return Number(a) + Number(b);
});
/**
* Applies a function to the value at the given index of an array, returning a
* new copy of the array with the element at the given index replaced with the
* result of the function application.
*
* @func
* @memberOf R
* @since v0.14.0
* @category List
* @sig (a -> a) -> Number -> [a] -> [a]
* @param {Function} fn The function to apply.
* @param {Number} idx The index.
* @param {Array|Arguments} list An array-like object whose value
* at the supplied index will be replaced.
* @return {Array} A copy of the supplied array-like object with
* the element at index `idx` replaced with the value
* returned by applying `fn` to the existing element.
* @see R.update
* @example
*
* R.adjust(R.add(10), 1, [1, 2, 3]); //=> [1, 12, 3]
* R.adjust(R.add(10))(1)([1, 2, 3]); //=> [1, 12, 3]
* @symb R.adjust(f, -1, [a, b]) = [a, f(b)]
* @symb R.adjust(f, 0, [a, b]) = [f(a), b]
*/
var adjust = _curry3(function adjust(fn, idx, list) {
if (idx >= list.length || idx < -list.length) {
return list;
}
var start = idx < 0 ? list.length : 0;
var _idx = start + idx;
var _list = _concat(list);
_list[_idx] = fn(list[_idx]);
return _list;
});
/**
* Returns `true` if all elements of the list match the predicate, `false` if
* there are any that don't.
*
* Dispatches to the `all` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a -> Boolean) -> [a] -> Boolean
* @param {Function} fn The predicate function.
* @param {Array} list The array to consider.
* @return {Boolean} `true` if the predicate is satisfied by every element, `false`
* otherwise.
* @see R.any, R.none, R.transduce
* @example
*
* var equals3 = R.equals(3);
* R.all(equals3)([3, 3, 3, 3]); //=> true
* R.all(equals3)([3, 3, 1, 3]); //=> false
*/
var all = _curry2(_dispatchable(['all'], _xall, function all(fn, list) {
var idx = 0;
while (idx < list.length) {
if (!fn(list[idx])) {
return false;
}
idx += 1;
}
return true;
}));
/**
* Returns a function that always returns the given value. Note that for
* non-primitives the value returned is a reference to the original value.
*
* This function is known as `const`, `constant`, or `K` (for K combinator) in
* other languages and libraries.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig a -> (* -> a)
* @param {*} val The value to wrap in a function
* @return {Function} A Function :: * -> val.
* @example
*
* var t = R.always('Tee');
* t(); //=> 'Tee'
*/
var always = _curry1(function always(val) {
return function () {
return val;
};
});
/**
* Returns `true` if both arguments are `true`; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Logic
* @sig a -> b -> a | b
* @param {Any} a
* @param {Any} b
* @return {Any} the first argument if it is falsy, otherwise the second argument.
* @see R.both
* @example
*
* R.and(true, true); //=> true
* R.and(true, false); //=> false
* R.and(false, true); //=> false
* R.and(false, false); //=> false
*/
var and = _curry2(function and(a, b) {
return a && b;
});
/**
* Returns `true` if at least one of elements of the list match the predicate,
* `false` otherwise.
*
* Dispatches to the `any` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a -> Boolean) -> [a] -> Boolean
* @param {Function} fn The predicate function.
* @param {Array} list The array to consider.
* @return {Boolean} `true` if the predicate is satisfied by at least one element, `false`
* otherwise.
* @see R.all, R.none, R.transduce
* @example
*
* var lessThan0 = R.flip(R.lt)(0);
* var lessThan2 = R.flip(R.lt)(2);
* R.any(lessThan0)([1, 2]); //=> false
* R.any(lessThan2)([1, 2]); //=> true
*/
var any = _curry2(_dispatchable(['any'], _xany, function any(fn, list) {
var idx = 0;
while (idx < list.length) {
if (fn(list[idx])) {
return true;
}
idx += 1;
}
return false;
}));
/**
* Returns a new list, composed of n-tuples of consecutive elements. If `n` is
* greater than the length of the list, an empty list is returned.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.12.0
* @category List
* @sig Number -> [a] -> [[a]]
* @param {Number} n The size of the tuples to create
* @param {Array} list The list to split into `n`-length tuples
* @return {Array} The resulting list of `n`-length tuples
* @see R.transduce
* @example
*
* R.aperture(2, [1, 2, 3, 4, 5]); //=> [[1, 2], [2, 3], [3, 4], [4, 5]]
* R.aperture(3, [1, 2, 3, 4, 5]); //=> [[1, 2, 3], [2, 3, 4], [3, 4, 5]]
* R.aperture(7, [1, 2, 3, 4, 5]); //=> []
*/
var aperture = _curry2(_dispatchable([], _xaperture, _aperture));
/**
* Returns a new list containing the contents of the given list, followed by
* the given element.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig a -> [a] -> [a]
* @param {*} el The element to add to the end of the new list.
* @param {Array} list The list of elements to add a new item to.
* list.
* @return {Array} A new list containing the elements of the old list followed by `el`.
* @see R.prepend
* @example
*
* R.append('tests', ['write', 'more']); //=> ['write', 'more', 'tests']
* R.append('tests', []); //=> ['tests']
* R.append(['tests'], ['write', 'more']); //=> ['write', 'more', ['tests']]
*/
var append = _curry2(function append(el, list) {
return _concat(list, [el]);
});
/**
* Applies function `fn` to the argument list `args`. This is useful for
* creating a fixed-arity function from a variadic function. `fn` should be a
* bound function if context is significant.
*
* @func
* @memberOf R
* @since v0.7.0
* @category Function
* @sig (*... -> a) -> [*] -> a
* @param {Function} fn The function which will be called with `args`
* @param {Array} args The arguments to call `fn` with
* @return {*} result The result, equivalent to `fn(...args)`
* @see R.call, R.unapply
* @example
*
* var nums = [1, 2, 3, -99, 42, 6, 7];
* R.apply(Math.max, nums); //=> 42
* @symb R.apply(f, [a, b, c]) = f(a, b, c)
*/
var apply = _curry2(function apply(fn, args) {
return fn.apply(this, args);
});
/**
* Makes an ascending comparator function out of a function that returns a value
* that can be compared with `<` and `>`.
*
* @func
* @memberOf R
* @since v0.23.0
* @category Function
* @sig Ord b => (a -> b) -> a -> a -> Number
* @param {Function} fn A function of arity one that returns a value that can be compared
* @param {*} a The first item to be compared.
* @param {*} b The second item to be compared.
* @return {Number} `-1` if fn(a) < fn(b), `1` if fn(b) < fn(a), otherwise `0`
* @see R.descend
* @example
*
* var byAge = R.ascend(R.prop('age'));
* var people = [
* // ...
* ];
* var peopleByYoungestFirst = R.sort(byAge, people);
*/
var ascend = _curry3(function ascend(fn, a, b) {
var aa = fn(a);
var bb = fn(b);
return aa < bb ? -1 : aa > bb ? 1 : 0;
});
/**
* Makes a shallow clone of an object, setting or overriding the specified
* property with the given value. Note that this copies and flattens prototype
* properties onto the new object as well. All non-primitive properties are
* copied by reference.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Object
* @sig String -> a -> {k: v} -> {k: v}
* @param {String} prop The property name to set
* @param {*} val The new value
* @param {Object} obj The object to clone
* @return {Object} A new object equivalent to the original except for the changed property.
* @see R.dissoc
* @example
*
* R.assoc('c', 3, {a: 1, b: 2}); //=> {a: 1, b: 2, c: 3}
*/
var assoc = _curry3(function assoc(prop, val, obj) {
var result = {};
for (var p in obj) {
result[p] = obj[p];
}
result[prop] = val;
return result;
});
/**
* Creates a function that is bound to a context.
* Note: `R.bind` does not provide the additional argument-binding capabilities of
* [Function.prototype.bind](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind).
*
* @func
* @memberOf R
* @since v0.6.0
* @category Function
* @category Object
* @sig (* -> *) -> {*} -> (* -> *)
* @param {Function} fn The function to bind to context
* @param {Object} thisObj The context to bind `fn` to
* @return {Function} A function that will execute in the context of `thisObj`.
* @see R.partial
* @example
*
* var log = R.bind(console.log, console);
* R.pipe(R.assoc('a', 2), R.tap(log), R.assoc('a', 3))({a: 1}); //=> {a: 3}
* // logs {a: 2}
* @symb R.bind(f, o)(a, b) = f.call(o, a, b)
*/
var bind = _curry2(function bind(fn, thisObj) {
return _arity(fn.length, function () {
return fn.apply(thisObj, arguments);
});
});
/**
* Restricts a number to be within a range.
*
* Also works for other ordered types such as Strings and Dates.
*
* @func
* @memberOf R
* @since v0.20.0
* @category Relation
* @sig Ord a => a -> a -> a -> a
* @param {Number} minimum The lower limit of the clamp (inclusive)
* @param {Number} maximum The upper limit of the clamp (inclusive)
* @param {Number} value Value to be clamped
* @return {Number} Returns `minimum` when `val < minimum`, `maximum` when `val > maximum`, returns `val` otherwise
* @example
*
* R.clamp(1, 10, -5) // => 1
* R.clamp(1, 10, 15) // => 10
* R.clamp(1, 10, 4) // => 4
*/
var clamp = _curry3(function clamp(min, max, value) {
if (min > max) {
throw new Error('min must not be greater than max in clamp(min, max, value)');
}
return value < min ? min : value > max ? max : value;
});
/**
* Makes a comparator function out of a function that reports whether the first
* element is less than the second.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a, b -> Boolean) -> (a, b -> Number)
* @param {Function} pred A predicate function of arity two which will return `true` if the first argument
* is less than the second, `false` otherwise
* @return {Function} A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`
* @example
*
* var byAge = R.comparator((a, b) => a.age < b.age);
* var people = [
* // ...
* ];
* var peopleByIncreasingAge = R.sort(byAge, people);
*/
var comparator = _curry1(function comparator(pred) {
return function (a, b) {
return pred(a, b) ? -1 : pred(b, a) ? 1 : 0;
};
});
/**
* Returns a curried equivalent of the provided function, with the specified
* arity. The curried function has two unusual capabilities. First, its
* arguments needn't be provided one at a time. If `g` is `R.curryN(3, f)`, the
* following are equivalent:
*
* - `g(1)(2)(3)`
* - `g(1)(2, 3)`
* - `g(1, 2)(3)`
* - `g(1, 2, 3)`
*
* Secondly, the special placeholder value [`R.__`](#__) may be used to specify
* "gaps", allowing partial application of any combination of arguments,
* regardless of their positions. If `g` is as above and `_` is [`R.__`](#__),
* the following are equivalent:
*
* - `g(1, 2, 3)`
* - `g(_, 2, 3)(1)`
* - `g(_, _, 3)(1)(2)`
* - `g(_, _, 3)(1, 2)`
* - `g(_, 2)(1)(3)`
* - `g(_, 2)(1, 3)`
* - `g(_, 2)(_, 3)(1)`
*
* @func
* @memberOf R
* @since v0.5.0
* @category Function
* @sig Number -> (* -> a) -> (* -> a)
* @param {Number} length The arity for the returned function.
* @param {Function} fn The function to curry.
* @return {Function} A new, curried function.
* @see R.curry
* @example
*
* var sumArgs = (...args) => R.sum(args);
*
* var curriedAddFourNumbers = R.curryN(4, sumArgs);
* var f = curriedAddFourNumbers(1, 2);
* var g = f(3);
* g(4); //=> 10
*/
var curryN = _curry2(function curryN(length, fn) {
if (length === 1) {
return _curry1(fn);
}
return _arity(length, _curryN(length, [], fn));
});
/**
* Decrements its argument.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Math
* @sig Number -> Number
* @param {Number} n
* @return {Number} n - 1
* @see R.inc
* @example
*
* R.dec(42); //=> 41
*/
var dec = add(-1);
/**
* Returns the second argument if it is not `null`, `undefined` or `NaN`;
* otherwise the first argument is returned.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Logic
* @sig a -> b -> a | b
* @param {a} default The default value.
* @param {b} val `val` will be returned instead of `default` unless `val` is `null`, `undefined` or `NaN`.
* @return {*} The second value if it is not `null`, `undefined` or `NaN`, otherwise the default value
* @example
*
* var defaultTo42 = R.defaultTo(42);
*
* defaultTo42(null); //=> 42
* defaultTo42(undefined); //=> 42
* defaultTo42('Ramda'); //=> 'Ramda'
* // parseInt('string') results in NaN
* defaultTo42(parseInt('string')); //=> 42
*/
var defaultTo = _curry2(function defaultTo(d, v) {
return v == null || v !== v ? d : v;
});
/**
* Makes a descending comparator function out of a function that returns a value
* that can be compared with `<` and `>`.
*
* @func
* @memberOf R
* @since v0.23.0
* @category Function
* @sig Ord b => (a -> b) -> a -> a -> Number
* @param {Function} fn A function of arity one that returns a value that can be compared
* @param {*} a The first item to be compared.
* @param {*} b The second item to be compared.
* @return {Number} `-1` if fn(a) > fn(b), `1` if fn(b) > fn(a), otherwise `0`
* @see R.ascend
* @example
*
* var byAge = R.descend(R.prop('age'));
* var people = [
* // ...
* ];
* var peopleByOldestFirst = R.sort(byAge, people);
*/
var descend = _curry3(function descend(fn, a, b) {
var aa = fn(a);
var bb = fn(b);
return aa > bb ? -1 : aa < bb ? 1 : 0;
});
/**
* Finds the set (i.e. no duplicates) of all elements in the first list not
* contained in the second list. Duplication is determined according to the
* value returned by applying the supplied predicate to two list elements.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig ((a, a) -> Boolean) -> [a] -> [a] -> [a]
* @param {Function} pred A predicate used to test whether two items are equal.
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The elements in `list1` that are not in `list2`.
* @see R.difference, R.symmetricDifference, R.symmetricDifferenceWith
* @example
*
* var cmp = (x, y) => x.a === y.a;
* var l1 = [{a: 1}, {a: 2}, {a: 3}];
* var l2 = [{a: 3}, {a: 4}];
* R.differenceWith(cmp, l1, l2); //=> [{a: 1}, {a: 2}]
*/
var differenceWith = _curry3(function differenceWith(pred, first, second) {
var out = [];
var idx = 0;
var firstLen = first.length;
while (idx < firstLen) {
if (!_containsWith(pred, first[idx], second) && !_containsWith(pred, first[idx], out)) {
out.push(first[idx]);
}
idx += 1;
}
return out;
});
/**
* Returns a new object that does not contain a `prop` property.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Object
* @sig String -> {k: v} -> {k: v}
* @param {String} prop The name of the property to dissociate
* @param {Object} obj The object to clone
* @return {Object} A new object equivalent to the original but without the specified property
* @see R.assoc
* @example
*
* R.dissoc('b', {a: 1, b: 2, c: 3}); //=> {a: 1, c: 3}
*/
var dissoc = _curry2(function dissoc(prop, obj) {
var result = {};
for (var p in obj) {
result[p] = obj[p];
}
delete result[prop];
return result;
});
/**
* Divides two numbers. Equivalent to `a / b`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig Number -> Number -> Number
* @param {Number} a The first value.
* @param {Number} b The second value.
* @return {Number} The result of `a / b`.
* @see R.multiply
* @example
*
* R.divide(71, 100); //=> 0.71
*
* var half = R.divide(R.__, 2);
* half(42); //=> 21
*
* var reciprocal = R.divide(1);
* reciprocal(4); //=> 0.25
*/
var divide = _curry2(function divide(a, b) {
return a / b;
});
/**
* Returns a new list excluding the leading elements of a given list which
* satisfy the supplied predicate function. It passes each value to the supplied
* predicate function, skipping elements while the predicate function returns
* `true`. The predicate function is applied to one argument: *(value)*.
*
* Dispatches to the `dropWhile` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.9.0
* @category List
* @sig (a -> Boolean) -> [a] -> [a]
* @param {Function} fn The function called per iteration.
* @param {Array} list The collection to iterate over.
* @return {Array} A new array.
* @see R.takeWhile, R.transduce, R.addIndex
* @example
*
* var lteTwo = x => x <= 2;
*
* R.dropWhile(lteTwo, [1, 2, 3, 4, 3, 2, 1]); //=> [3, 4, 3, 2, 1]
*/
var dropWhile = _curry2(_dispatchable(['dropWhile'], _xdropWhile, function dropWhile(pred, list) {
var idx = 0;
var len = list.length;
while (idx < len && pred(list[idx])) {
idx += 1;
}
return Array.prototype.slice.call(list, idx);
}));
/**
* Returns the empty value of its argument's type. Ramda defines the empty
* value of Array (`[]`), Object (`{}`), String (`''`), and Arguments. Other
* types are supported if they define `<Type>.empty` and/or
* `<Type>.prototype.empty`.
*
* Dispatches to the `empty` method of the first argument, if present.
*
* @func
* @memberOf R
* @since v0.3.0
* @category Function
* @sig a -> a
* @param {*} x
* @return {*}
* @example
*
* R.empty(Just(42)); //=> Nothing()
* R.empty([1, 2, 3]); //=> []
* R.empty('unicorns'); //=> ''
* R.empty({x: 1, y: 2}); //=> {}
*/
// else
var empty = _curry1(function empty(x) {
return x != null && typeof x['fantasy-land/empty'] === 'function' ? x['fantasy-land/empty']() : x != null && x.constructor != null && typeof x.constructor['fantasy-land/empty'] === 'function' ? x.constructor['fantasy-land/empty']() : x != null && typeof x.empty === 'function' ? x.empty() : x != null && x.constructor != null && typeof x.constructor.empty === 'function' ? x.constructor.empty() : _isArray(x) ? [] : _isString(x) ? '' : _isObject(x) ? {} : _isArguments(x) ? function () {
return arguments;
}() : // else
void 0;
});
/**
* Creates a new object by recursively evolving a shallow copy of `object`,
* according to the `transformation` functions. All non-primitive properties
* are copied by reference.
*
* A `transformation` function will not be invoked if its corresponding key
* does not exist in the evolved object.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Object
* @sig {k: (v -> v)} -> {k: v} -> {k: v}
* @param {Object} transformations The object specifying transformation functions to apply
* to the object.
* @param {Object} object The object to be transformed.
* @return {Object} The transformed object.
* @example
*
* var tomato = {firstName: ' Tomato ', data: {elapsed: 100, remaining: 1400}, id:123};
* var transformations = {
* firstName: R.trim,
* lastName: R.trim, // Will not get invoked.
* data: {elapsed: R.add(1), remaining: R.add(-1)}
* };
* R.evolve(transformations, tomato); //=> {firstName: 'Tomato', data: {elapsed: 101, remaining: 1399}, id:123}
*/
var evolve = _curry2(function evolve(transformations, object) {
var result = {};
var transformation, key, type;
for (key in object) {
transformation = transformations[key];
type = typeof transformation;
result[key] = type === 'function' ? transformation(object[key]) : transformation && type === 'object' ? evolve(transformation, object[key]) : object[key];
}
return result;
});
/**
* Returns the first element of the list which matches the predicate, or
* `undefined` if no element matches.
*
* Dispatches to the `find` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a -> Boolean) -> [a] -> a | undefined
* @param {Function} fn The predicate function used to determine if the element is the
* desired one.
* @param {Array} list The array to consider.
* @return {Object} The element found, or `undefined`.
* @see R.transduce
* @example
*
* var xs = [{a: 1}, {a: 2}, {a: 3}];
* R.find(R.propEq('a', 2))(xs); //=> {a: 2}
* R.find(R.propEq('a', 4))(xs); //=> undefined
*/
var find = _curry2(_dispatchable(['find'], _xfind, function find(fn, list) {
var idx = 0;
var len = list.length;
while (idx < len) {
if (fn(list[idx])) {
return list[idx];
}
idx += 1;
}
}));
/**
* Returns the index of the first element of the list which matches the
* predicate, or `-1` if no element matches.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.1
* @category List
* @sig (a -> Boolean) -> [a] -> Number
* @param {Function} fn The predicate function used to determine if the element is the
* desired one.
* @param {Array} list The array to consider.
* @return {Number} The index of the element found, or `-1`.
* @see R.transduce
* @example
*
* var xs = [{a: 1}, {a: 2}, {a: 3}];
* R.findIndex(R.propEq('a', 2))(xs); //=> 1
* R.findIndex(R.propEq('a', 4))(xs); //=> -1
*/
var findIndex = _curry2(_dispatchable([], _xfindIndex, function findIndex(fn, list) {
var idx = 0;
var len = list.length;
while (idx < len) {
if (fn(list[idx])) {
return idx;
}
idx += 1;
}
return -1;
}));
/**
* Returns the last element of the list which matches the predicate, or
* `undefined` if no element matches.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.1
* @category List
* @sig (a -> Boolean) -> [a] -> a | undefined
* @param {Function} fn The predicate function used to determine if the element is the
* desired one.
* @param {Array} list The array to consider.
* @return {Object} The element found, or `undefined`.
* @see R.transduce
* @example
*
* var xs = [{a: 1, b: 0}, {a:1, b: 1}];
* R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}
* R.findLast(R.propEq('a', 4))(xs); //=> undefined
*/
var findLast = _curry2(_dispatchable([], _xfindLast, function findLast(fn, list) {
var idx = list.length - 1;
while (idx >= 0) {
if (fn(list[idx])) {
return list[idx];
}
idx -= 1;
}
}));
/**
* Returns the index of the last element of the list which matches the
* predicate, or `-1` if no element matches.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.1
* @category List
* @sig (a -> Boolean) -> [a] -> Number
* @param {Function} fn The predicate function used to determine if the element is the
* desired one.
* @param {Array} list The array to consider.
* @return {Number} The index of the element found, or `-1`.
* @see R.transduce
* @example
*
* var xs = [{a: 1, b: 0}, {a:1, b: 1}];
* R.findLastIndex(R.propEq('a', 1))(xs); //=> 1
* R.findLastIndex(R.propEq('a', 4))(xs); //=> -1
*/
var findLastIndex = _curry2(_dispatchable([], _xfindLastIndex, function findLastIndex(fn, list) {
var idx = list.length - 1;
while (idx >= 0) {
if (fn(list[idx])) {
return idx;
}
idx -= 1;
}
return -1;
}));
/**
* Returns a new list by pulling every item out of it (and all its sub-arrays)
* and putting them in a new array, depth-first.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [b]
* @param {Array} list The array to consider.
* @return {Array} The flattened list.
* @see R.unnest
* @example
*
* R.flatten([1, 2, [3, 4], 5, [6, [7, 8, [9, [10, 11], 12]]]]);
* //=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
*/
var flatten = _curry1(_makeFlat(true));
/**
* Iterate over an input `list`, calling a provided function `fn` for each
* element in the list.
*
* `fn` receives one argument: *(value)*.
*
* Note: `R.forEach` does not skip deleted or unassigned indices (sparse
* arrays), unlike the native `Array.prototype.forEach` method. For more
* details on this behavior, see:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Description
*
* Also note that, unlike `Array.prototype.forEach`, Ramda's `forEach` returns
* the original array. In some libraries this function is named `each`.
*
* Dispatches to the `forEach` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.1.1
* @category List
* @sig (a -> *) -> [a] -> [a]
* @param {Function} fn The function to invoke. Receives one argument, `value`.
* @param {Array} list The list to iterate over.
* @return {Array} The original list.
* @see R.addIndex
* @example
*
* var printXPlusFive = x => console.log(x + 5);
* R.forEach(printXPlusFive, [1, 2, 3]); //=> [1, 2, 3]
* // logs 6
* // logs 7
* // logs 8
* @symb R.forEach(f, [a, b, c]) = [a, b, c]
*/
var forEach = _curry2(_checkForMethod('forEach', function forEach(fn, list) {
var len = list.length;
var idx = 0;
while (idx < len) {
fn(list[idx]);
idx += 1;
}
return list;
}));
/**
* Creates a new object from a list key-value pairs. If a key appears in
* multiple pairs, the rightmost pair is included in the object.
*
* @func
* @memberOf R
* @since v0.3.0
* @category List
* @sig [[k,v]] -> {k: v}
* @param {Array} pairs An array of two-element arrays that will be the keys and values of the output object.
* @return {Object} The object made by pairing up `keys` and `values`.
* @see R.toPairs, R.pair
* @example
*
* R.fromPairs([['a', 1], ['b', 2], ['c', 3]]); //=> {a: 1, b: 2, c: 3}
*/
var fromPairs = _curry1(function fromPairs(pairs) {
var result = {};
var idx = 0;
while (idx < pairs.length) {
result[pairs[idx][0]] = pairs[idx][1];
idx += 1;
}
return result;
});
/**
* Takes a list and returns a list of lists where each sublist's elements are
* all satisfied pairwise comparison according to the provided function.
* Only adjacent elements are passed to the comparison function.
*
* @func
* @memberOf R
* @since v0.21.0
* @category List
* @sig ((a, a) → Boolean) → [a] → [[a]]
* @param {Function} fn Function for determining whether two given (adjacent)
* elements should be in the same group
* @param {Array} list The array to group. Also accepts a string, which will be
* treated as a list of characters.
* @return {List} A list that contains sublists of elements,
* whose concatenations are equal to the original list.
* @example
*
* R.groupWith(R.equals, [0, 1, 1, 2, 3, 5, 8, 13, 21])
* //=> [[0], [1, 1], [2], [3], [5], [8], [13], [21]]
*
* R.groupWith((a, b) => a + 1 === b, [0, 1, 1, 2, 3, 5, 8, 13, 21])
* //=> [[0, 1], [1, 2, 3], [5], [8], [13], [21]]
*
* R.groupWith((a, b) => a % 2 === b % 2, [0, 1, 1, 2, 3, 5, 8, 13, 21])
* //=> [[0], [1, 1], [2], [3, 5], [8], [13, 21]]
*
* R.groupWith(R.eqBy(isVowel), 'aestiou')
* //=> ['ae', 'st', 'iou']
*/
var groupWith = _curry2(function (fn, list) {
var res = [];
var idx = 0;
var len = list.length;
while (idx < len) {
var nextidx = idx + 1;
while (nextidx < len && fn(list[nextidx - 1], list[nextidx])) {
nextidx += 1;
}
res.push(list.slice(idx, nextidx));
idx = nextidx;
}
return res;
});
/**
* Returns `true` if the first argument is greater than the second; `false`
* otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> Boolean
* @param {*} a
* @param {*} b
* @return {Boolean}
* @see R.lt
* @example
*
* R.gt(2, 1); //=> true
* R.gt(2, 2); //=> false
* R.gt(2, 3); //=> false
* R.gt('a', 'z'); //=> false
* R.gt('z', 'a'); //=> true
*/
var gt = _curry2(function gt(a, b) {
return a > b;
});
/**
* Returns `true` if the first argument is greater than or equal to the second;
* `false` otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> Boolean
* @param {Number} a
* @param {Number} b
* @return {Boolean}
* @see R.lte
* @example
*
* R.gte(2, 1); //=> true
* R.gte(2, 2); //=> true
* R.gte(2, 3); //=> false
* R.gte('a', 'z'); //=> false
* R.gte('z', 'a'); //=> true
*/
var gte = _curry2(function gte(a, b) {
return a >= b;
});
/**
* Returns whether or not an object has an own property with the specified name
*
* @func
* @memberOf R
* @since v0.7.0
* @category Object
* @sig s -> {s: x} -> Boolean
* @param {String} prop The name of the property to check for.
* @param {Object} obj The object to query.
* @return {Boolean} Whether the property exists.
* @example
*
* var hasName = R.has('name');
* hasName({name: 'alice'}); //=> true
* hasName({name: 'bob'}); //=> true
* hasName({}); //=> false
*
* var point = {x: 0, y: 0};
* var pointHas = R.has(R.__, point);
* pointHas('x'); //=> true
* pointHas('y'); //=> true
* pointHas('z'); //=> false
*/
var has = _curry2(_has);
/**
* Returns whether or not an object or its prototype chain has a property with
* the specified name
*
* @func
* @memberOf R
* @since v0.7.0
* @category Object
* @sig s -> {s: x} -> Boolean
* @param {String} prop The name of the property to check for.
* @param {Object} obj The object to query.
* @return {Boolean} Whether the property exists.
* @example
*
* function Rectangle(width, height) {
* this.width = width;
* this.height = height;
* }
* Rectangle.prototype.area = function() {
* return this.width * this.height;
* };
*
* var square = new Rectangle(2, 2);
* R.hasIn('width', square); //=> true
* R.hasIn('area', square); //=> true
*/
var hasIn = _curry2(function hasIn(prop, obj) {
return prop in obj;
});
/**
* Returns true if its arguments are identical, false otherwise. Values are
* identical if they reference the same memory. `NaN` is identical to `NaN`;
* `0` and `-0` are not identical.
*
* @func
* @memberOf R
* @since v0.15.0
* @category Relation
* @sig a -> a -> Boolean
* @param {*} a
* @param {*} b
* @return {Boolean}
* @example
*
* var o = {};
* R.identical(o, o); //=> true
* R.identical(1, 1); //=> true
* R.identical(1, '1'); //=> false
* R.identical([], []); //=> false
* R.identical(0, -0); //=> false
* R.identical(NaN, NaN); //=> true
*/
// SameValue algorithm
// Steps 1-5, 7-10
// Steps 6.b-6.e: +0 != -0
// Step 6.a: NaN == NaN
var identical = _curry2(function identical(a, b) {
// SameValue algorithm
if (a === b) {
// Steps 1-5, 7-10
// Steps 6.b-6.e: +0 != -0
return a !== 0 || 1 / a === 1 / b;
} else {
// Step 6.a: NaN == NaN
return a !== a && b !== b;
}
});
/**
* A function that does nothing but return the parameter supplied to it. Good
* as a default or placeholder function.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig a -> a
* @param {*} x The value to return.
* @return {*} The input value, `x`.
* @example
*
* R.identity(1); //=> 1
*
* var obj = {};
* R.identity(obj) === obj; //=> true
* @symb R.identity(a) = a
*/
var identity = _curry1(_identity);
/**
* Creates a function that will process either the `onTrue` or the `onFalse`
* function depending upon the result of the `condition` predicate.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Logic
* @sig (*... -> Boolean) -> (*... -> *) -> (*... -> *) -> (*... -> *)
* @param {Function} condition A predicate function
* @param {Function} onTrue A function to invoke when the `condition` evaluates to a truthy value.
* @param {Function} onFalse A function to invoke when the `condition` evaluates to a falsy value.
* @return {Function} A new unary function that will process either the `onTrue` or the `onFalse`
* function depending upon the result of the `condition` predicate.
* @see R.unless, R.when
* @example
*
* var incCount = R.ifElse(
* R.has('count'),
* R.over(R.lensProp('count'), R.inc),
* R.assoc('count', 1)
* );
* incCount({}); //=> { count: 1 }
* incCount({ count: 1 }); //=> { count: 2 }
*/
var ifElse = _curry3(function ifElse(condition, onTrue, onFalse) {
return curryN(Math.max(condition.length, onTrue.length, onFalse.length), function _ifElse() {
return condition.apply(this, arguments) ? onTrue.apply(this, arguments) : onFalse.apply(this, arguments);
});
});
/**
* Increments its argument.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Math
* @sig Number -> Number
* @param {Number} n
* @return {Number} n + 1
* @see R.dec
* @example
*
* R.inc(42); //=> 43
*/
var inc = add(1);
/**
* Takes a predicate `pred`, a list `xs`, and a list `ys`, and returns a list
* `xs'` comprising each of the elements of `xs` which is equal to one or more
* elements of `ys` according to `pred`.
*
* `pred` must be a binary function expecting an element from each list.
*
* `xs`, `ys`, and `xs'` are treated as sets, semantically, so ordering should
* not be significant, but since `xs'` is ordered the implementation guarantees
* that its values are in the same order as they appear in `xs`. Duplicates are
* not removed, so `xs'` may contain duplicates if `xs` contains duplicates.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Relation
* @sig (a -> b -> Boolean) -> [a] -> [b] -> [a]
* @param {Function} pred
* @param {Array} xs
* @param {Array} ys
* @return {Array}
* @see R.intersection
* @example
*
* R.innerJoin(
* (record, id) => record.id === id,
* [{id: 824, name: 'Richie Furay'},
* {id: 956, name: 'Dewey Martin'},
* {id: 313, name: 'Bruce Palmer'},
* {id: 456, name: 'Stephen Stills'},
* {id: 177, name: 'Neil Young'}],
* [177, 456, 999]
* );
* //=> [{id: 456, name: 'Stephen Stills'}, {id: 177, name: 'Neil Young'}]
*/
var innerJoin = _curry3(function innerJoin(pred, xs, ys) {
return _filter(function (x) {
return _containsWith(pred, x, ys);
}, xs);
});
/**
* Inserts the supplied element into the list, at the specified `index`. _Note that
* this is not destructive_: it returns a copy of the list with the changes.
* <small>No lists have been harmed in the application of this function.</small>
*
* @func
* @memberOf R
* @since v0.2.2
* @category List
* @sig Number -> a -> [a] -> [a]
* @param {Number} index The position to insert the element
* @param {*} elt The element to insert into the Array
* @param {Array} list The list to insert into
* @return {Array} A new Array with `elt` inserted at `index`.
* @example
*
* R.insert(2, 'x', [1,2,3,4]); //=> [1,2,'x',3,4]
*/
var insert = _curry3(function insert(idx, elt, list) {
idx = idx < list.length && idx >= 0 ? idx : list.length;
var result = Array.prototype.slice.call(list, 0);
result.splice(idx, 0, elt);
return result;
});
/**
* Inserts the sub-list into the list, at the specified `index`. _Note that this is not
* destructive_: it returns a copy of the list with the changes.
* <small>No lists have been harmed in the application of this function.</small>
*
* @func
* @memberOf R
* @since v0.9.0
* @category List
* @sig Number -> [a] -> [a] -> [a]
* @param {Number} index The position to insert the sub-list
* @param {Array} elts The sub-list to insert into the Array
* @param {Array} list The list to insert the sub-list into
* @return {Array} A new Array with `elts` inserted starting at `index`.
* @example
*
* R.insertAll(2, ['x','y','z'], [1,2,3,4]); //=> [1,2,'x','y','z',3,4]
*/
var insertAll = _curry3(function insertAll(idx, elts, list) {
idx = idx < list.length && idx >= 0 ? idx : list.length;
return [].concat(Array.prototype.slice.call(list, 0, idx), elts, Array.prototype.slice.call(list, idx));
});
/**
* Creates a new list with the separator interposed between elements.
*
* Dispatches to the `intersperse` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.14.0
* @category List
* @sig a -> [a] -> [a]
* @param {*} separator The element to add to the list.
* @param {Array} list The list to be interposed.
* @return {Array} The new list.
* @example
*
* R.intersperse('n', ['ba', 'a', 'a']); //=> ['ba', 'n', 'a', 'n', 'a']
*/
var intersperse = _curry2(_checkForMethod('intersperse', function intersperse(separator, list) {
var out = [];
var idx = 0;
var length = list.length;
while (idx < length) {
if (idx === length - 1) {
out.push(list[idx]);
} else {
out.push(list[idx], separator);
}
idx += 1;
}
return out;
}));
/**
* See if an object (`val`) is an instance of the supplied constructor. This
* function will check up the inheritance chain, if any.
*
* @func
* @memberOf R
* @since v0.3.0
* @category Type
* @sig (* -> {*}) -> a -> Boolean
* @param {Object} ctor A constructor
* @param {*} val The value to test
* @return {Boolean}
* @example
*
* R.is(Object, {}); //=> true
* R.is(Number, 1); //=> true
* R.is(Object, 1); //=> false
* R.is(String, 's'); //=> true
* R.is(String, new String('')); //=> true
* R.is(Object, new String('')); //=> true
* R.is(Object, 's'); //=> false
* R.is(Number, {}); //=> false
*/
var is = _curry2(function is(Ctor, val) {
return val != null && val.constructor === Ctor || val instanceof Ctor;
});
/**
* Checks if the input value is `null` or `undefined`.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Type
* @sig * -> Boolean
* @param {*} x The value to test.
* @return {Boolean} `true` if `x` is `undefined` or `null`, otherwise `false`.
* @example
*
* R.isNil(null); //=> true
* R.isNil(undefined); //=> true
* R.isNil(0); //=> false
* R.isNil([]); //=> false
*/
var isNil = _curry1(function isNil(x) {
return x == null;
});
/**
* Returns a list containing the names of all the enumerable own properties of
* the supplied object.
* Note that the order of the output array is not guaranteed to be consistent
* across different JS platforms.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig {k: v} -> [k]
* @param {Object} obj The object to extract properties from
* @return {Array} An array of the object's own properties.
* @see R.keysIn, R.values
* @example
*
* R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']
*/
// cover IE < 9 keys issues
// Safari bug
var keys = function () {
// cover IE < 9 keys issues
var hasEnumBug = !{ toString: null }.propertyIsEnumerable('toString');
var nonEnumerableProps = [
'constructor',
'valueOf',
'isPrototypeOf',
'toString',
'propertyIsEnumerable',
'hasOwnProperty',
'toLocaleString'
];
// Safari bug
var hasArgsEnumBug = function () {
'use strict';
return arguments.propertyIsEnumerable('length');
}();
var contains = function contains(list, item) {
var idx = 0;
while (idx < list.length) {
if (list[idx] === item) {
return true;
}
idx += 1;
}
return false;
};
return typeof Object.keys === 'function' && !hasArgsEnumBug ? _curry1(function keys(obj) {
return Object(obj) !== obj ? [] : Object.keys(obj);
}) : _curry1(function keys(obj) {
if (Object(obj) !== obj) {
return [];
}
var prop, nIdx;
var ks = [];
var checkArgsLength = hasArgsEnumBug && _isArguments(obj);
for (prop in obj) {
if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {
ks[ks.length] = prop;
}
}
if (hasEnumBug) {
nIdx = nonEnumerableProps.length - 1;
while (nIdx >= 0) {
prop = nonEnumerableProps[nIdx];
if (_has(prop, obj) && !contains(ks, prop)) {
ks[ks.length] = prop;
}
nIdx -= 1;
}
}
return ks;
});
}();
/**
* Returns a list containing the names of all the properties of the supplied
* object, including prototype properties.
* Note that the order of the output array is not guaranteed to be consistent
* across different JS platforms.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Object
* @sig {k: v} -> [k]
* @param {Object} obj The object to extract properties from
* @return {Array} An array of the object's own and prototype properties.
* @see R.keys, R.valuesIn
* @example
*
* var F = function() { this.x = 'X'; };
* F.prototype.y = 'Y';
* var f = new F();
* R.keysIn(f); //=> ['x', 'y']
*/
var keysIn = _curry1(function keysIn(obj) {
var prop;
var ks = [];
for (prop in obj) {
ks[ks.length] = prop;
}
return ks;
});
/**
* Returns the number of elements in the array by returning `list.length`.
*
* @func
* @memberOf R
* @since v0.3.0
* @category List
* @sig [a] -> Number
* @param {Array} list The array to inspect.
* @return {Number} The length of the array.
* @example
*
* R.length([]); //=> 0
* R.length([1, 2, 3]); //=> 3
*/
var length = _curry1(function length(list) {
return list != null && _isNumber(list.length) ? list.length : NaN;
});
/**
* Returns `true` if the first argument is less than the second; `false`
* otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> Boolean
* @param {*} a
* @param {*} b
* @return {Boolean}
* @see R.gt
* @example
*
* R.lt(2, 1); //=> false
* R.lt(2, 2); //=> false
* R.lt(2, 3); //=> true
* R.lt('a', 'z'); //=> true
* R.lt('z', 'a'); //=> false
*/
var lt = _curry2(function lt(a, b) {
return a < b;
});
/**
* Returns `true` if the first argument is less than or equal to the second;
* `false` otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> Boolean
* @param {Number} a
* @param {Number} b
* @return {Boolean}
* @see R.gte
* @example
*
* R.lte(2, 1); //=> false
* R.lte(2, 2); //=> true
* R.lte(2, 3); //=> true
* R.lte('a', 'z'); //=> true
* R.lte('z', 'a'); //=> false
*/
var lte = _curry2(function lte(a, b) {
return a <= b;
});
/**
* The `mapAccum` function behaves like a combination of map and reduce; it
* applies a function to each element of a list, passing an accumulating
* parameter from left to right, and returning a final value of this
* accumulator together with the new list.
*
* The iterator function receives two arguments, *acc* and *value*, and should
* return a tuple *[acc, value]*.
*
* @func
* @memberOf R
* @since v0.10.0
* @category List
* @sig (acc -> x -> (acc, y)) -> acc -> [x] -> (acc, [y])
* @param {Function} fn The function to be called on every element of the input `list`.
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.addIndex, R.mapAccumRight
* @example
*
* var digits = ['1', '2', '3', '4'];
* var appender = (a, b) => [a + b, a + b];
*
* R.mapAccum(appender, 0, digits); //=> ['01234', ['01', '012', '0123', '01234']]
* @symb R.mapAccum(f, a, [b, c, d]) = [
* f(f(f(a, b)[0], c)[0], d)[0],
* [
* f(a, b)[1],
* f(f(a, b)[0], c)[1],
* f(f(f(a, b)[0], c)[0], d)[1]
* ]
* ]
*/
var mapAccum = _curry3(function mapAccum(fn, acc, list) {
var idx = 0;
var len = list.length;
var result = [];
var tuple = [acc];
while (idx < len) {
tuple = fn(tuple[0], list[idx]);
result[idx] = tuple[1];
idx += 1;
}
return [
tuple[0],
result
];
});
/**
* The `mapAccumRight` function behaves like a combination of map and reduce; it
* applies a function to each element of a list, passing an accumulating
* parameter from right to left, and returning a final value of this
* accumulator together with the new list.
*
* Similar to [`mapAccum`](#mapAccum), except moves through the input list from
* the right to the left.
*
* The iterator function receives two arguments, *value* and *acc*, and should
* return a tuple *[value, acc]*.
*
* @func
* @memberOf R
* @since v0.10.0
* @category List
* @sig (x-> acc -> (y, acc)) -> acc -> [x] -> ([y], acc)
* @param {Function} fn The function to be called on every element of the input `list`.
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.addIndex, R.mapAccum
* @example
*
* var digits = ['1', '2', '3', '4'];
* var append = (a, b) => [a + b, a + b];
*
* R.mapAccumRight(append, 5, digits); //=> [['12345', '2345', '345', '45'], '12345']
* @symb R.mapAccumRight(f, a, [b, c, d]) = [
* [
* f(b, f(c, f(d, a)[0])[0])[1],
* f(c, f(d, a)[0])[1],
* f(d, a)[1],
* ]
* f(b, f(c, f(d, a)[0])[0])[0],
* ]
*/
var mapAccumRight = _curry3(function mapAccumRight(fn, acc, list) {
var idx = list.length - 1;
var result = [];
var tuple = [acc];
while (idx >= 0) {
tuple = fn(list[idx], tuple[0]);
result[idx] = tuple[1];
idx -= 1;
}
return [
result,
tuple[0]
];
});
/**
* Tests a regular expression against a String. Note that this function will
* return an empty array when there are no matches. This differs from
* [`String.prototype.match`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match)
* which returns `null` when there are no matches.
*
* @func
* @memberOf R
* @since v0.1.0
* @category String
* @sig RegExp -> String -> [String | Undefined]
* @param {RegExp} rx A regular expression.
* @param {String} str The string to match against
* @return {Array} The list of matches or empty array.
* @see R.test
* @example
*
* R.match(/([a-z]a)/g, 'bananas'); //=> ['ba', 'na', 'na']
* R.match(/a/, 'b'); //=> []
* R.match(/a/, null); //=> TypeError: null does not have a method named "match"
*/
var match = _curry2(function match(rx, str) {
return str.match(rx) || [];
});
/**
* `mathMod` behaves like the modulo operator should mathematically, unlike the
* `%` operator (and by extension, [`R.modulo`](#modulo)). So while
* `-17 % 5` is `-2`, `mathMod(-17, 5)` is `3`. `mathMod` requires Integer
* arguments, and returns NaN when the modulus is zero or negative.
*
* @func
* @memberOf R
* @since v0.3.0
* @category Math
* @sig Number -> Number -> Number
* @param {Number} m The dividend.
* @param {Number} p the modulus.
* @return {Number} The result of `b mod a`.
* @see R.modulo
* @example
*
* R.mathMod(-17, 5); //=> 3
* R.mathMod(17, 5); //=> 2
* R.mathMod(17, -5); //=> NaN
* R.mathMod(17, 0); //=> NaN
* R.mathMod(17.2, 5); //=> NaN
* R.mathMod(17, 5.3); //=> NaN
*
* var clock = R.mathMod(R.__, 12);
* clock(15); //=> 3
* clock(24); //=> 0
*
* var seventeenMod = R.mathMod(17);
* seventeenMod(3); //=> 2
* seventeenMod(4); //=> 1
* seventeenMod(10); //=> 7
*/
var mathMod = _curry2(function mathMod(m, p) {
if (!_isInteger(m)) {
return NaN;
}
if (!_isInteger(p) || p < 1) {
return NaN;
}
return (m % p + p) % p;
});
/**
* Returns the larger of its two arguments.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> a
* @param {*} a
* @param {*} b
* @return {*}
* @see R.maxBy, R.min
* @example
*
* R.max(789, 123); //=> 789
* R.max('a', 'b'); //=> 'b'
*/
var max = _curry2(function max(a, b) {
return b > a ? b : a;
});
/**
* Takes a function and two values, and returns whichever value produces the
* larger result when passed to the provided function.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Relation
* @sig Ord b => (a -> b) -> a -> a -> a
* @param {Function} f
* @param {*} a
* @param {*} b
* @return {*}
* @see R.max, R.minBy
* @example
*
* // square :: Number -> Number
* var square = n => n * n;
*
* R.maxBy(square, -3, 2); //=> -3
*
* R.reduce(R.maxBy(square), 0, [3, -5, 4, 1, -2]); //=> -5
* R.reduce(R.maxBy(square), 0, []); //=> 0
*/
var maxBy = _curry3(function maxBy(f, a, b) {
return f(b) > f(a) ? b : a;
});
/**
* A customisable version of [`R.memoize`](#memoize). `memoizeWith` takes an
* additional function that will be applied to a given argument set and used to
* create the cache key under which the results of the function to be memoized
* will be stored. Care must be taken when implementing key generation to avoid
* clashes that may overwrite previous entries erroneously.
*
*
* @func
* @memberOf R
* @since v0.24.0
* @category Function
* @sig (*... -> String) -> (*... -> a) -> (*... -> a)
* @param {Function} fn The function to generate the cache key.
* @param {Function} fn The function to memoize.
* @return {Function} Memoized version of `fn`.
* @see R.memoize
* @example
*
* let count = 0;
* const factorial = R.memoizeWith(R.identity, n => {
* count += 1;
* return R.product(R.range(1, n + 1));
* });
* factorial(5); //=> 120
* factorial(5); //=> 120
* factorial(5); //=> 120
* count; //=> 1
*/
var memoizeWith = _curry2(function memoizeWith(mFn, fn) {
var cache = {};
return _arity(fn.length, function () {
var key = mFn.apply(this, arguments);
if (!_has(key, cache)) {
cache[key] = fn.apply(this, arguments);
}
return cache[key];
});
});
/**
* Create a new object with the own properties of the first object merged with
* the own properties of the second object. If a key exists in both objects,
* the value from the second object will be used.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig {k: v} -> {k: v} -> {k: v}
* @param {Object} l
* @param {Object} r
* @return {Object}
* @see R.mergeDeepRight, R.mergeWith, R.mergeWithKey
* @example
*
* R.merge({ 'name': 'fred', 'age': 10 }, { 'age': 40 });
* //=> { 'name': 'fred', 'age': 40 }
*
* var resetToDefault = R.merge(R.__, {x: 0});
* resetToDefault({x: 5, y: 2}); //=> {x: 0, y: 2}
* @symb R.merge({ x: 1, y: 2 }, { y: 5, z: 3 }) = { x: 1, y: 5, z: 3 }
*/
var merge = _curry2(function merge(l, r) {
return _assign({}, l, r);
});
/**
* Merges a list of objects together into one object.
*
* @func
* @memberOf R
* @since v0.10.0
* @category List
* @sig [{k: v}] -> {k: v}
* @param {Array} list An array of objects
* @return {Object} A merged object.
* @see R.reduce
* @example
*
* R.mergeAll([{foo:1},{bar:2},{baz:3}]); //=> {foo:1,bar:2,baz:3}
* R.mergeAll([{foo:1},{foo:2},{bar:2}]); //=> {foo:2,bar:2}
* @symb R.mergeAll([{ x: 1 }, { y: 2 }, { z: 3 }]) = { x: 1, y: 2, z: 3 }
*/
var mergeAll = _curry1(function mergeAll(list) {
return _assign.apply(null, [{}].concat(list));
});
/**
* Creates a new object with the own properties of the two provided objects. If
* a key exists in both objects, the provided function is applied to the key
* and the values associated with the key in each object, with the result being
* used as the value associated with the key in the returned object.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Object
* @sig (String -> a -> a -> a) -> {a} -> {a} -> {a}
* @param {Function} fn
* @param {Object} l
* @param {Object} r
* @return {Object}
* @see R.mergeDeepWithKey, R.merge, R.mergeWith
* @example
*
* let concatValues = (k, l, r) => k == 'values' ? R.concat(l, r) : r
* R.mergeWithKey(concatValues,
* { a: true, thing: 'foo', values: [10, 20] },
* { b: true, thing: 'bar', values: [15, 35] });
* //=> { a: true, b: true, thing: 'bar', values: [10, 20, 15, 35] }
* @symb R.mergeWithKey(f, { x: 1, y: 2 }, { y: 5, z: 3 }) = { x: 1, y: f('y', 2, 5), z: 3 }
*/
var mergeWithKey = _curry3(function mergeWithKey(fn, l, r) {
var result = {};
var k;
for (k in l) {
if (_has(k, l)) {
result[k] = _has(k, r) ? fn(k, l[k], r[k]) : l[k];
}
}
for (k in r) {
if (_has(k, r) && !_has(k, result)) {
result[k] = r[k];
}
}
return result;
});
/**
* Returns the smaller of its two arguments.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord a => a -> a -> a
* @param {*} a
* @param {*} b
* @return {*}
* @see R.minBy, R.max
* @example
*
* R.min(789, 123); //=> 123
* R.min('a', 'b'); //=> 'a'
*/
var min = _curry2(function min(a, b) {
return b < a ? b : a;
});
/**
* Takes a function and two values, and returns whichever value produces the
* smaller result when passed to the provided function.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Relation
* @sig Ord b => (a -> b) -> a -> a -> a
* @param {Function} f
* @param {*} a
* @param {*} b
* @return {*}
* @see R.min, R.maxBy
* @example
*
* // square :: Number -> Number
* var square = n => n * n;
*
* R.minBy(square, -3, 2); //=> 2
*
* R.reduce(R.minBy(square), Infinity, [3, -5, 4, 1, -2]); //=> 1
* R.reduce(R.minBy(square), Infinity, []); //=> Infinity
*/
var minBy = _curry3(function minBy(f, a, b) {
return f(b) < f(a) ? b : a;
});
/**
* Divides the first parameter by the second and returns the remainder. Note
* that this function preserves the JavaScript-style behavior for modulo. For
* mathematical modulo see [`mathMod`](#mathMod).
*
* @func
* @memberOf R
* @since v0.1.1
* @category Math
* @sig Number -> Number -> Number
* @param {Number} a The value to the divide.
* @param {Number} b The pseudo-modulus
* @return {Number} The result of `b % a`.
* @see R.mathMod
* @example
*
* R.modulo(17, 3); //=> 2
* // JS behavior:
* R.modulo(-17, 3); //=> -2
* R.modulo(17, -3); //=> 2
*
* var isOdd = R.modulo(R.__, 2);
* isOdd(42); //=> 0
* isOdd(21); //=> 1
*/
var modulo = _curry2(function modulo(a, b) {
return a % b;
});
/**
* Multiplies two numbers. Equivalent to `a * b` but curried.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig Number -> Number -> Number
* @param {Number} a The first value.
* @param {Number} b The second value.
* @return {Number} The result of `a * b`.
* @see R.divide
* @example
*
* var double = R.multiply(2);
* var triple = R.multiply(3);
* double(3); //=> 6
* triple(4); //=> 12
* R.multiply(2, 5); //=> 10
*/
var multiply = _curry2(function multiply(a, b) {
return a * b;
});
/**
* Wraps a function of any arity (including nullary) in a function that accepts
* exactly `n` parameters. Any extraneous parameters will not be passed to the
* supplied function.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig Number -> (* -> a) -> (* -> a)
* @param {Number} n The desired arity of the new function.
* @param {Function} fn The function to wrap.
* @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
* arity `n`.
* @see R.binary, R.unary
* @example
*
* var takesTwoArgs = (a, b) => [a, b];
*
* takesTwoArgs.length; //=> 2
* takesTwoArgs(1, 2); //=> [1, 2]
*
* var takesOneArg = R.nAry(1, takesTwoArgs);
* takesOneArg.length; //=> 1
* // Only `n` arguments are passed to the wrapped function
* takesOneArg(1, 2); //=> [1, undefined]
* @symb R.nAry(0, f)(a, b) = f()
* @symb R.nAry(1, f)(a, b) = f(a)
* @symb R.nAry(2, f)(a, b) = f(a, b)
*/
var nAry = _curry2(function nAry(n, fn) {
switch (n) {
case 0:
return function () {
return fn.call(this);
};
case 1:
return function (a0) {
return fn.call(this, a0);
};
case 2:
return function (a0, a1) {
return fn.call(this, a0, a1);
};
case 3:
return function (a0, a1, a2) {
return fn.call(this, a0, a1, a2);
};
case 4:
return function (a0, a1, a2, a3) {
return fn.call(this, a0, a1, a2, a3);
};
case 5:
return function (a0, a1, a2, a3, a4) {
return fn.call(this, a0, a1, a2, a3, a4);
};
case 6:
return function (a0, a1, a2, a3, a4, a5) {
return fn.call(this, a0, a1, a2, a3, a4, a5);
};
case 7:
return function (a0, a1, a2, a3, a4, a5, a6) {
return fn.call(this, a0, a1, a2, a3, a4, a5, a6);
};
case 8:
return function (a0, a1, a2, a3, a4, a5, a6, a7) {
return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7);
};
case 9:
return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {
return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8);
};
case 10:
return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {
return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9);
};
default:
throw new Error('First argument to nAry must be a non-negative integer no greater than ten');
}
});
/**
* Negates its argument.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Math
* @sig Number -> Number
* @param {Number} n
* @return {Number}
* @example
*
* R.negate(42); //=> -42
*/
var negate = _curry1(function negate(n) {
return -n;
});
/**
* Returns `true` if no elements of the list match the predicate, `false`
* otherwise.
*
* Dispatches to the `any` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.12.0
* @category List
* @sig (a -> Boolean) -> [a] -> Boolean
* @param {Function} fn The predicate function.
* @param {Array} list The array to consider.
* @return {Boolean} `true` if the predicate is not satisfied by every element, `false` otherwise.
* @see R.all, R.any
* @example
*
* var isEven = n => n % 2 === 0;
*
* R.none(isEven, [1, 3, 5, 7, 9, 11]); //=> true
* R.none(isEven, [1, 3, 5, 7, 8, 11]); //=> false
*/
var none = _curry2(_complement(_dispatchable(['any'], _xany, any)));
/**
* A function that returns the `!` of its argument. It will return `true` when
* passed false-y value, and `false` when passed a truth-y one.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Logic
* @sig * -> Boolean
* @param {*} a any value
* @return {Boolean} the logical inverse of passed argument.
* @see R.complement
* @example
*
* R.not(true); //=> false
* R.not(false); //=> true
* R.not(0); //=> true
* R.not(1); //=> false
*/
var not = _curry1(function not(a) {
return !a;
});
/**
* Returns the nth element of the given list or string. If n is negative the
* element at index length + n is returned.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Number -> [a] -> a | Undefined
* @sig Number -> String -> String
* @param {Number} offset
* @param {*} list
* @return {*}
* @example
*
* var list = ['foo', 'bar', 'baz', 'quux'];
* R.nth(1, list); //=> 'bar'
* R.nth(-1, list); //=> 'quux'
* R.nth(-99, list); //=> undefined
*
* R.nth(2, 'abc'); //=> 'c'
* R.nth(3, 'abc'); //=> ''
* @symb R.nth(-1, [a, b, c]) = c
* @symb R.nth(0, [a, b, c]) = a
* @symb R.nth(1, [a, b, c]) = b
*/
var nth = _curry2(function nth(offset, list) {
var idx = offset < 0 ? list.length + offset : offset;
return _isString(list) ? list.charAt(idx) : list[idx];
});
/**
* Returns a function which returns its nth argument.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Function
* @sig Number -> *... -> *
* @param {Number} n
* @return {Function}
* @example
*
* R.nthArg(1)('a', 'b', 'c'); //=> 'b'
* R.nthArg(-1)('a', 'b', 'c'); //=> 'c'
* @symb R.nthArg(-1)(a, b, c) = c
* @symb R.nthArg(0)(a, b, c) = a
* @symb R.nthArg(1)(a, b, c) = b
*/
var nthArg = _curry1(function nthArg(n) {
var arity = n < 0 ? 1 : n + 1;
return curryN(arity, function () {
return nth(n, arguments);
});
});
/**
* `o` is a curried composition function that returns a unary function.
* Like [`compose`](#compose), `o` performs right-to-left function composition.
* Unlike [`compose`](#compose), the rightmost function passed to `o` will be
* invoked with only one argument.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Function
* @sig (b -> c) -> (a -> b) -> a -> c
* @param {Function} f
* @param {Function} g
* @return {Function}
* @see R.compose, R.pipe
* @example
*
* var classyGreeting = name => "The name's " + name.last + ", " + name.first + " " + lastName
* var yellGreeting = R.o(R.toUpper, classyGreeting);
* yellGreeting({first: 'James', last: 'Bond'}); //=> "THE NAME'S BOND, JAMES BOND"
*
* R.o(R.multiply(10), R.add(10))(-4) //=> 60
*
* @symb R.o(f, g, x) = f(g(x))
*/
var o = _curry3(function o(f, g, x) {
return f(g(x));
});
/**
* Creates an object containing a single key:value pair.
*
* @func
* @memberOf R
* @since v0.18.0
* @category Object
* @sig String -> a -> {String:a}
* @param {String} key
* @param {*} val
* @return {Object}
* @see R.pair
* @example
*
* var matchPhrases = R.compose(
* R.objOf('must'),
* R.map(R.objOf('match_phrase'))
* );
* matchPhrases(['foo', 'bar', 'baz']); //=> {must: [{match_phrase: 'foo'}, {match_phrase: 'bar'}, {match_phrase: 'baz'}]}
*/
var objOf = _curry2(function objOf(key, val) {
var obj = {};
obj[key] = val;
return obj;
});
/**
* Returns a singleton array containing the value provided.
*
* Note this `of` is different from the ES6 `of`; See
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of
*
* @func
* @memberOf R
* @since v0.3.0
* @category Function
* @sig a -> [a]
* @param {*} x any value
* @return {Array} An array wrapping `x`.
* @example
*
* R.of(null); //=> [null]
* R.of([42]); //=> [[42]]
*/
var of = _curry1(_of);
/**
* Accepts a function `fn` and returns a function that guards invocation of
* `fn` such that `fn` can only ever be called once, no matter how many times
* the returned function is invoked. The first value calculated is returned in
* subsequent invocations.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a... -> b) -> (a... -> b)
* @param {Function} fn The function to wrap in a call-only-once wrapper.
* @return {Function} The wrapped function.
* @example
*
* var addOneOnce = R.once(x => x + 1);
* addOneOnce(10); //=> 11
* addOneOnce(addOneOnce(50)); //=> 11
*/
var once = _curry1(function once(fn) {
var called = false;
var result;
return _arity(fn.length, function () {
if (called) {
return result;
}
called = true;
result = fn.apply(this, arguments);
return result;
});
});
/**
* Returns `true` if one or both of its arguments are `true`. Returns `false`
* if both arguments are `false`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Logic
* @sig a -> b -> a | b
* @param {Any} a
* @param {Any} b
* @return {Any} the first argument if truthy, otherwise the second argument.
* @see R.either
* @example
*
* R.or(true, true); //=> true
* R.or(true, false); //=> true
* R.or(false, true); //=> true
* R.or(false, false); //=> false
*/
var or = _curry2(function or(a, b) {
return a || b;
});
/**
* Returns the result of "setting" the portion of the given data structure
* focused by the given lens to the result of applying the given function to
* the focused value.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig Lens s a -> (a -> a) -> s -> s
* @param {Lens} lens
* @param {*} v
* @param {*} x
* @return {*}
* @see R.prop, R.lensIndex, R.lensProp
* @example
*
* var headLens = R.lensIndex(0);
*
* R.over(headLens, R.toUpper, ['foo', 'bar', 'baz']); //=> ['FOO', 'bar', 'baz']
*/
// `Identity` is a functor that holds a single value, where `map` simply
// transforms the held value with the provided function.
// The value returned by the getter function is first transformed with `f`,
// then set as the value of an `Identity`. This is then mapped over with the
// setter function of the lens.
var over = function () {
// `Identity` is a functor that holds a single value, where `map` simply
// transforms the held value with the provided function.
var Identity = function (x) {
return {
value: x,
map: function (f) {
return Identity(f(x));
}
};
};
return _curry3(function over(lens, f, x) {
// The value returned by the getter function is first transformed with `f`,
// then set as the value of an `Identity`. This is then mapped over with the
// setter function of the lens.
return lens(function (y) {
return Identity(f(y));
})(x).value;
});
}();
/**
* Takes two arguments, `fst` and `snd`, and returns `[fst, snd]`.
*
* @func
* @memberOf R
* @since v0.18.0
* @category List
* @sig a -> b -> (a,b)
* @param {*} fst
* @param {*} snd
* @return {Array}
* @see R.objOf, R.of
* @example
*
* R.pair('foo', 'bar'); //=> ['foo', 'bar']
*/
var pair = _curry2(function pair(fst, snd) {
return [
fst,
snd
];
});
/**
* Retrieve the value at a given path.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Object
* @typedefn Idx = String | Int
* @sig [Idx] -> {a} -> a | Undefined
* @param {Array} path The path to use.
* @param {Object} obj The object to retrieve the nested property from.
* @return {*} The data at `path`.
* @see R.prop
* @example
*
* R.path(['a', 'b'], {a: {b: 2}}); //=> 2
* R.path(['a', 'b'], {c: {b: 2}}); //=> undefined
*/
var path = _curry2(function path(paths, obj) {
var val = obj;
var idx = 0;
while (idx < paths.length) {
if (val == null) {
return;
}
val = val[paths[idx]];
idx += 1;
}
return val;
});
/**
* If the given, non-null object has a value at the given path, returns the
* value at that path. Otherwise returns the provided default value.
*
* @func
* @memberOf R
* @since v0.18.0
* @category Object
* @typedefn Idx = String | Int
* @sig a -> [Idx] -> {a} -> a
* @param {*} d The default value.
* @param {Array} p The path to use.
* @param {Object} obj The object to retrieve the nested property from.
* @return {*} The data at `path` of the supplied object or the default value.
* @example
*
* R.pathOr('N/A', ['a', 'b'], {a: {b: 2}}); //=> 2
* R.pathOr('N/A', ['a', 'b'], {c: {b: 2}}); //=> "N/A"
*/
var pathOr = _curry3(function pathOr(d, p, obj) {
return defaultTo(d, path(p, obj));
});
/**
* Returns `true` if the specified object property at given path satisfies the
* given predicate; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Logic
* @typedefn Idx = String | Int
* @sig (a -> Boolean) -> [Idx] -> {a} -> Boolean
* @param {Function} pred
* @param {Array} propPath
* @param {*} obj
* @return {Boolean}
* @see R.propSatisfies, R.path
* @example
*
* R.pathSatisfies(y => y > 0, ['x', 'y'], {x: {y: 2}}); //=> true
*/
var pathSatisfies = _curry3(function pathSatisfies(pred, propPath, obj) {
return propPath.length > 0 && pred(path(propPath, obj));
});
/**
* Returns a partial copy of an object containing only the keys specified. If
* the key does not exist, the property is ignored.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig [k] -> {k: v} -> {k: v}
* @param {Array} names an array of String property names to copy onto a new object
* @param {Object} obj The object to copy from
* @return {Object} A new object with only properties from `names` on it.
* @see R.omit, R.props
* @example
*
* R.pick(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}
* R.pick(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1}
*/
var pick = _curry2(function pick(names, obj) {
var result = {};
var idx = 0;
while (idx < names.length) {
if (names[idx] in obj) {
result[names[idx]] = obj[names[idx]];
}
idx += 1;
}
return result;
});
/**
* Similar to `pick` except that this one includes a `key: undefined` pair for
* properties that don't exist.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig [k] -> {k: v} -> {k: v}
* @param {Array} names an array of String property names to copy onto a new object
* @param {Object} obj The object to copy from
* @return {Object} A new object with only properties from `names` on it.
* @see R.pick
* @example
*
* R.pickAll(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}
* R.pickAll(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, e: undefined, f: undefined}
*/
var pickAll = _curry2(function pickAll(names, obj) {
var result = {};
var idx = 0;
var len = names.length;
while (idx < len) {
var name = names[idx];
result[name] = obj[name];
idx += 1;
}
return result;
});
/**
* Returns a partial copy of an object containing only the keys that satisfy
* the supplied predicate.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Object
* @sig (v, k -> Boolean) -> {k: v} -> {k: v}
* @param {Function} pred A predicate to determine whether or not a key
* should be included on the output object.
* @param {Object} obj The object to copy from
* @return {Object} A new object with only properties that satisfy `pred`
* on it.
* @see R.pick, R.filter
* @example
*
* var isUpperCase = (val, key) => key.toUpperCase() === key;
* R.pickBy(isUpperCase, {a: 1, b: 2, A: 3, B: 4}); //=> {A: 3, B: 4}
*/
var pickBy = _curry2(function pickBy(test, obj) {
var result = {};
for (var prop in obj) {
if (test(obj[prop], prop, obj)) {
result[prop] = obj[prop];
}
}
return result;
});
/**
* Returns a new list with the given element at the front, followed by the
* contents of the list.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig a -> [a] -> [a]
* @param {*} el The item to add to the head of the output list.
* @param {Array} list The array to add to the tail of the output list.
* @return {Array} A new array.
* @see R.append
* @example
*
* R.prepend('fee', ['fi', 'fo', 'fum']); //=> ['fee', 'fi', 'fo', 'fum']
*/
var prepend = _curry2(function prepend(el, list) {
return _concat([el], list);
});
/**
* Returns a function that when supplied an object returns the indicated
* property of that object, if it exists.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig s -> {s: a} -> a | Undefined
* @param {String} p The property name
* @param {Object} obj The object to query
* @return {*} The value at `obj.p`.
* @see R.path
* @example
*
* R.prop('x', {x: 100}); //=> 100
* R.prop('x', {}); //=> undefined
*/
var prop = _curry2(function prop(p, obj) {
return obj[p];
});
/**
* Returns `true` if the specified object property is of the given type;
* `false` otherwise.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Type
* @sig Type -> String -> Object -> Boolean
* @param {Function} type
* @param {String} name
* @param {*} obj
* @return {Boolean}
* @see R.is, R.propSatisfies
* @example
*
* R.propIs(Number, 'x', {x: 1, y: 2}); //=> true
* R.propIs(Number, 'x', {x: 'foo'}); //=> false
* R.propIs(Number, 'x', {}); //=> false
*/
var propIs = _curry3(function propIs(type, name, obj) {
return is(type, obj[name]);
});
/**
* If the given, non-null object has an own property with the specified name,
* returns the value of that property. Otherwise returns the provided default
* value.
*
* @func
* @memberOf R
* @since v0.6.0
* @category Object
* @sig a -> String -> Object -> a
* @param {*} val The default value.
* @param {String} p The name of the property to return.
* @param {Object} obj The object to query.
* @return {*} The value of given property of the supplied object or the default value.
* @example
*
* var alice = {
* name: 'ALICE',
* age: 101
* };
* var favorite = R.prop('favoriteLibrary');
* var favoriteWithDefault = R.propOr('Ramda', 'favoriteLibrary');
*
* favorite(alice); //=> undefined
* favoriteWithDefault(alice); //=> 'Ramda'
*/
var propOr = _curry3(function propOr(val, p, obj) {
return obj != null && _has(p, obj) ? obj[p] : val;
});
/**
* Returns `true` if the specified object property satisfies the given
* predicate; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Logic
* @sig (a -> Boolean) -> String -> {String: a} -> Boolean
* @param {Function} pred
* @param {String} name
* @param {*} obj
* @return {Boolean}
* @see R.propEq, R.propIs
* @example
*
* R.propSatisfies(x => x > 0, 'x', {x: 1, y: 2}); //=> true
*/
var propSatisfies = _curry3(function propSatisfies(pred, name, obj) {
return pred(obj[name]);
});
/**
* Acts as multiple `prop`: array of keys in, array of values out. Preserves
* order.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig [k] -> {k: v} -> [v]
* @param {Array} ps The property names to fetch
* @param {Object} obj The object to query
* @return {Array} The corresponding values or partially applied function.
* @example
*
* R.props(['x', 'y'], {x: 1, y: 2}); //=> [1, 2]
* R.props(['c', 'a', 'b'], {b: 2, a: 1}); //=> [undefined, 1, 2]
*
* var fullName = R.compose(R.join(' '), R.props(['first', 'last']));
* fullName({last: 'Bullet-Tooth', age: 33, first: 'Tony'}); //=> 'Tony Bullet-Tooth'
*/
var props = _curry2(function props(ps, obj) {
var len = ps.length;
var out = [];
var idx = 0;
while (idx < len) {
out[idx] = obj[ps[idx]];
idx += 1;
}
return out;
});
/**
* Returns a list of numbers from `from` (inclusive) to `to` (exclusive).
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Number -> Number -> [Number]
* @param {Number} from The first number in the list.
* @param {Number} to One more than the last number in the list.
* @return {Array} The list of numbers in tthe set `[a, b)`.
* @example
*
* R.range(1, 5); //=> [1, 2, 3, 4]
* R.range(50, 53); //=> [50, 51, 52]
*/
var range = _curry2(function range(from, to) {
if (!(_isNumber(from) && _isNumber(to))) {
throw new TypeError('Both arguments to range must be numbers');
}
var result = [];
var n = from;
while (n < to) {
result.push(n);
n += 1;
}
return result;
});
/**
* Returns a single item by iterating through the list, successively calling
* the iterator function and passing it an accumulator value and the current
* value from the array, and then passing the result to the next call.
*
* Similar to [`reduce`](#reduce), except moves through the input list from the
* right to the left.
*
* The iterator function receives two values: *(value, acc)*, while the arguments'
* order of `reduce`'s iterator function is *(acc, value)*.
*
* Note: `R.reduceRight` does not skip deleted or unassigned indices (sparse
* arrays), unlike the native `Array.prototype.reduceRight` method. For more details
* on this behavior, see:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight#Description
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a, b -> b) -> b -> [a] -> b
* @param {Function} fn The iterator function. Receives two values, the current element from the array
* and the accumulator.
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.reduce, R.addIndex
* @example
*
* R.reduceRight(R.subtract, 0, [1, 2, 3, 4]) // => (1 - (2 - (3 - (4 - 0)))) = -2
* - -2
* / \ / \
* 1 - 1 3
* / \ / \
* 2 - ==> 2 -1
* / \ / \
* 3 - 3 4
* / \ / \
* 4 0 4 0
*
* @symb R.reduceRight(f, a, [b, c, d]) = f(b, f(c, f(d, a)))
*/
var reduceRight = _curry3(function reduceRight(fn, acc, list) {
var idx = list.length - 1;
while (idx >= 0) {
acc = fn(list[idx], acc);
idx -= 1;
}
return acc;
});
/**
* Returns a value wrapped to indicate that it is the final value of the reduce
* and transduce functions. The returned value should be considered a black
* box: the internal structure is not guaranteed to be stable.
*
* Note: this optimization is unavailable to functions not explicitly listed
* above. For instance, it is not currently supported by
* [`reduceRight`](#reduceRight).
*
* @func
* @memberOf R
* @since v0.15.0
* @category List
* @sig a -> *
* @param {*} x The final value of the reduce.
* @return {*} The wrapped value.
* @see R.reduce, R.transduce
* @example
*
* R.reduce(
* (acc, item) => item > 3 ? R.reduced(acc) : acc.concat(item),
* [],
* [1, 2, 3, 4, 5]) // [1, 2, 3]
*/
var reduced = _curry1(_reduced);
/**
* Removes the sub-list of `list` starting at index `start` and containing
* `count` elements. _Note that this is not destructive_: it returns a copy of
* the list with the changes.
* <small>No lists have been harmed in the application of this function.</small>
*
* @func
* @memberOf R
* @since v0.2.2
* @category List
* @sig Number -> Number -> [a] -> [a]
* @param {Number} start The position to start removing elements
* @param {Number} count The number of elements to remove
* @param {Array} list The list to remove from
* @return {Array} A new Array with `count` elements from `start` removed.
* @example
*
* R.remove(2, 3, [1,2,3,4,5,6,7,8]); //=> [1,2,6,7,8]
*/
var remove = _curry3(function remove(start, count, list) {
var result = Array.prototype.slice.call(list, 0);
result.splice(start, count);
return result;
});
/**
* Replace a substring or regex match in a string with a replacement.
*
* @func
* @memberOf R
* @since v0.7.0
* @category String
* @sig RegExp|String -> String -> String -> String
* @param {RegExp|String} pattern A regular expression or a substring to match.
* @param {String} replacement The string to replace the matches with.
* @param {String} str The String to do the search and replacement in.
* @return {String} The result.
* @example
*
* R.replace('foo', 'bar', 'foo foo foo'); //=> 'bar foo foo'
* R.replace(/foo/, 'bar', 'foo foo foo'); //=> 'bar foo foo'
*
* // Use the "g" (global) flag to replace all occurrences:
* R.replace(/foo/g, 'bar', 'foo foo foo'); //=> 'bar bar bar'
*/
var replace = _curry3(function replace(regex, replacement, str) {
return str.replace(regex, replacement);
});
/**
* Returns a new list or string with the elements or characters in reverse
* order.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [a]
* @sig String -> String
* @param {Array|String} list
* @return {Array|String}
* @example
*
* R.reverse([1, 2, 3]); //=> [3, 2, 1]
* R.reverse([1, 2]); //=> [2, 1]
* R.reverse([1]); //=> [1]
* R.reverse([]); //=> []
*
* R.reverse('abc'); //=> 'cba'
* R.reverse('ab'); //=> 'ba'
* R.reverse('a'); //=> 'a'
* R.reverse(''); //=> ''
*/
var reverse = _curry1(function reverse(list) {
return _isString(list) ? list.split('').reverse().join('') : Array.prototype.slice.call(list, 0).reverse();
});
/**
* Scan is similar to [`reduce`](#reduce), but returns a list of successively
* reduced values from the left
*
* @func
* @memberOf R
* @since v0.10.0
* @category List
* @sig (a,b -> a) -> a -> [b] -> [a]
* @param {Function} fn The iterator function. Receives two values, the accumulator and the
* current element from the array
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {Array} A list of all intermediately reduced values.
* @see R.reduce
* @example
*
* var numbers = [1, 2, 3, 4];
* var factorials = R.scan(R.multiply, 1, numbers); //=> [1, 1, 2, 6, 24]
* @symb R.scan(f, a, [b, c]) = [a, f(a, b), f(f(a, b), c)]
*/
var scan = _curry3(function scan(fn, acc, list) {
var idx = 0;
var len = list.length;
var result = [acc];
while (idx < len) {
acc = fn(acc, list[idx]);
result[idx + 1] = acc;
idx += 1;
}
return result;
});
/**
* Returns the result of "setting" the portion of the given data structure
* focused by the given lens to the given value.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig Lens s a -> a -> s -> s
* @param {Lens} lens
* @param {*} v
* @param {*} x
* @return {*}
* @see R.prop, R.lensIndex, R.lensProp
* @example
*
* var xLens = R.lensProp('x');
*
* R.set(xLens, 4, {x: 1, y: 2}); //=> {x: 4, y: 2}
* R.set(xLens, 8, {x: 1, y: 2}); //=> {x: 8, y: 2}
*/
var set = _curry3(function set(lens, v, x) {
return over(lens, always(v), x);
});
/**
* Returns the elements of the given list or string (or object with a `slice`
* method) from `fromIndex` (inclusive) to `toIndex` (exclusive).
*
* Dispatches to the `slice` method of the third argument, if present.
*
* @func
* @memberOf R
* @since v0.1.4
* @category List
* @sig Number -> Number -> [a] -> [a]
* @sig Number -> Number -> String -> String
* @param {Number} fromIndex The start index (inclusive).
* @param {Number} toIndex The end index (exclusive).
* @param {*} list
* @return {*}
* @example
*
* R.slice(1, 3, ['a', 'b', 'c', 'd']); //=> ['b', 'c']
* R.slice(1, Infinity, ['a', 'b', 'c', 'd']); //=> ['b', 'c', 'd']
* R.slice(0, -1, ['a', 'b', 'c', 'd']); //=> ['a', 'b', 'c']
* R.slice(-3, -1, ['a', 'b', 'c', 'd']); //=> ['b', 'c']
* R.slice(0, 3, 'ramda'); //=> 'ram'
*/
var slice = _curry3(_checkForMethod('slice', function slice(fromIndex, toIndex, list) {
return Array.prototype.slice.call(list, fromIndex, toIndex);
}));
/**
* Returns a copy of the list, sorted according to the comparator function,
* which should accept two values at a time and return a negative number if the
* first value is smaller, a positive number if it's larger, and zero if they
* are equal. Please note that this is a **copy** of the list. It does not
* modify the original.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a,a -> Number) -> [a] -> [a]
* @param {Function} comparator A sorting function :: a -> b -> Int
* @param {Array} list The list to sort
* @return {Array} a new array with its elements sorted by the comparator function.
* @example
*
* var diff = function(a, b) { return a - b; };
* R.sort(diff, [4,2,7,5]); //=> [2, 4, 5, 7]
*/
var sort = _curry2(function sort(comparator, list) {
return Array.prototype.slice.call(list, 0).sort(comparator);
});
/**
* Sorts the list according to the supplied function.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig Ord b => (a -> b) -> [a] -> [a]
* @param {Function} fn
* @param {Array} list The list to sort.
* @return {Array} A new list sorted by the keys generated by `fn`.
* @example
*
* var sortByFirstItem = R.sortBy(R.prop(0));
* var sortByNameCaseInsensitive = R.sortBy(R.compose(R.toLower, R.prop('name')));
* var pairs = [[-1, 1], [-2, 2], [-3, 3]];
* sortByFirstItem(pairs); //=> [[-3, 3], [-2, 2], [-1, 1]]
* var alice = {
* name: 'ALICE',
* age: 101
* };
* var bob = {
* name: 'Bob',
* age: -10
* };
* var clara = {
* name: 'clara',
* age: 314.159
* };
* var people = [clara, bob, alice];
* sortByNameCaseInsensitive(people); //=> [alice, bob, clara]
*/
var sortBy = _curry2(function sortBy(fn, list) {
return Array.prototype.slice.call(list, 0).sort(function (a, b) {
var aa = fn(a);
var bb = fn(b);
return aa < bb ? -1 : aa > bb ? 1 : 0;
});
});
/**
* Sorts a list according to a list of comparators.
*
* @func
* @memberOf R
* @since v0.23.0
* @category Relation
* @sig [a -> a -> Number] -> [a] -> [a]
* @param {Array} functions A list of comparator functions.
* @param {Array} list The list to sort.
* @return {Array} A new list sorted according to the comarator functions.
* @example
*
* var alice = {
* name: 'alice',
* age: 40
* };
* var bob = {
* name: 'bob',
* age: 30
* };
* var clara = {
* name: 'clara',
* age: 40
* };
* var people = [clara, bob, alice];
* var ageNameSort = R.sortWith([
* R.descend(R.prop('age')),
* R.ascend(R.prop('name'))
* ]);
* ageNameSort(people); //=> [alice, clara, bob]
*/
var sortWith = _curry2(function sortWith(fns, list) {
return Array.prototype.slice.call(list, 0).sort(function (a, b) {
var result = 0;
var i = 0;
while (result === 0 && i < fns.length) {
result = fns[i](a, b);
i += 1;
}
return result;
});
});
/**
* Splits a given list or string at a given index.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig Number -> [a] -> [[a], [a]]
* @sig Number -> String -> [String, String]
* @param {Number} index The index where the array/string is split.
* @param {Array|String} array The array/string to be split.
* @return {Array}
* @example
*
* R.splitAt(1, [1, 2, 3]); //=> [[1], [2, 3]]
* R.splitAt(5, 'hello world'); //=> ['hello', ' world']
* R.splitAt(-1, 'foobar'); //=> ['fooba', 'r']
*/
var splitAt = _curry2(function splitAt(index, array) {
return [
slice(0, index, array),
slice(index, length(array), array)
];
});
/**
* Splits a collection into slices of the specified length.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig Number -> [a] -> [[a]]
* @sig Number -> String -> [String]
* @param {Number} n
* @param {Array} list
* @return {Array}
* @example
*
* R.splitEvery(3, [1, 2, 3, 4, 5, 6, 7]); //=> [[1, 2, 3], [4, 5, 6], [7]]
* R.splitEvery(3, 'foobarbaz'); //=> ['foo', 'bar', 'baz']
*/
var splitEvery = _curry2(function splitEvery(n, list) {
if (n <= 0) {
throw new Error('First argument to splitEvery must be a positive integer');
}
var result = [];
var idx = 0;
while (idx < list.length) {
result.push(slice(idx, idx += n, list));
}
return result;
});
/**
* Takes a list and a predicate and returns a pair of lists with the following properties:
*
* - the result of concatenating the two output lists is equivalent to the input list;
* - none of the elements of the first output list satisfies the predicate; and
* - if the second output list is non-empty, its first element satisfies the predicate.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig (a -> Boolean) -> [a] -> [[a], [a]]
* @param {Function} pred The predicate that determines where the array is split.
* @param {Array} list The array to be split.
* @return {Array}
* @example
*
* R.splitWhen(R.equals(2), [1, 2, 3, 1, 2, 3]); //=> [[1], [2, 3, 1, 2, 3]]
*/
var splitWhen = _curry2(function splitWhen(pred, list) {
var idx = 0;
var len = list.length;
var prefix = [];
while (idx < len && !pred(list[idx])) {
prefix.push(list[idx]);
idx += 1;
}
return [
prefix,
Array.prototype.slice.call(list, idx)
];
});
/**
* Subtracts its second argument from its first argument.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig Number -> Number -> Number
* @param {Number} a The first value.
* @param {Number} b The second value.
* @return {Number} The result of `a - b`.
* @see R.add
* @example
*
* R.subtract(10, 8); //=> 2
*
* var minus5 = R.subtract(R.__, 5);
* minus5(17); //=> 12
*
* var complementaryAngle = R.subtract(90);
* complementaryAngle(30); //=> 60
* complementaryAngle(72); //=> 18
*/
var subtract = _curry2(function subtract(a, b) {
return Number(a) - Number(b);
});
/**
* Returns all but the first element of the given list or string (or object
* with a `tail` method).
*
* Dispatches to the `slice` method of the first argument, if present.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [a]
* @sig String -> String
* @param {*} list
* @return {*}
* @see R.head, R.init, R.last
* @example
*
* R.tail([1, 2, 3]); //=> [2, 3]
* R.tail([1, 2]); //=> [2]
* R.tail([1]); //=> []
* R.tail([]); //=> []
*
* R.tail('abc'); //=> 'bc'
* R.tail('ab'); //=> 'b'
* R.tail('a'); //=> ''
* R.tail(''); //=> ''
*/
var tail = _curry1(_checkForMethod('tail', slice(1, Infinity)));
/**
* Returns the first `n` elements of the given list, string, or
* transducer/transformer (or object with a `take` method).
*
* Dispatches to the `take` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Number -> [a] -> [a]
* @sig Number -> String -> String
* @param {Number} n
* @param {*} list
* @return {*}
* @see R.drop
* @example
*
* R.take(1, ['foo', 'bar', 'baz']); //=> ['foo']
* R.take(2, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']
* R.take(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
* R.take(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
* R.take(3, 'ramda'); //=> 'ram'
*
* var personnel = [
* 'Dave Brubeck',
* 'Paul Desmond',
* 'Eugene Wright',
* 'Joe Morello',
* 'Gerry Mulligan',
* 'Bob Bates',
* 'Joe Dodge',
* 'Ron Crotty'
* ];
*
* var takeFive = R.take(5);
* takeFive(personnel);
* //=> ['Dave Brubeck', 'Paul Desmond', 'Eugene Wright', 'Joe Morello', 'Gerry Mulligan']
* @symb R.take(-1, [a, b]) = [a, b]
* @symb R.take(0, [a, b]) = []
* @symb R.take(1, [a, b]) = [a]
* @symb R.take(2, [a, b]) = [a, b]
*/
var take = _curry2(_dispatchable(['take'], _xtake, function take(n, xs) {
return slice(0, n < 0 ? Infinity : n, xs);
}));
/**
* Returns a new list containing the last `n` elements of a given list, passing
* each value to the supplied predicate function, and terminating when the
* predicate function returns `false`. Excludes the element that caused the
* predicate function to fail. The predicate function is passed one argument:
* *(value)*.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig (a -> Boolean) -> [a] -> [a]
* @param {Function} fn The function called per iteration.
* @param {Array} list The collection to iterate over.
* @return {Array} A new array.
* @see R.dropLastWhile, R.addIndex
* @example
*
* var isNotOne = x => x !== 1;
*
* R.takeLastWhile(isNotOne, [1, 2, 3, 4]); //=> [2, 3, 4]
*/
var takeLastWhile = _curry2(function takeLastWhile(fn, list) {
var idx = list.length - 1;
while (idx >= 0 && fn(list[idx])) {
idx -= 1;
}
return Array.prototype.slice.call(list, idx + 1);
});
/**
* Returns a new list containing the first `n` elements of a given list,
* passing each value to the supplied predicate function, and terminating when
* the predicate function returns `false`. Excludes the element that caused the
* predicate function to fail. The predicate function is passed one argument:
* *(value)*.
*
* Dispatches to the `takeWhile` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a -> Boolean) -> [a] -> [a]
* @param {Function} fn The function called per iteration.
* @param {Array} list The collection to iterate over.
* @return {Array} A new array.
* @see R.dropWhile, R.transduce, R.addIndex
* @example
*
* var isNotFour = x => x !== 4;
*
* R.takeWhile(isNotFour, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3]
*/
var takeWhile = _curry2(_dispatchable(['takeWhile'], _xtakeWhile, function takeWhile(fn, list) {
var idx = 0;
var len = list.length;
while (idx < len && fn(list[idx])) {
idx += 1;
}
return Array.prototype.slice.call(list, 0, idx);
}));
/**
* Runs the given function with the supplied object, then returns the object.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a -> *) -> a -> a
* @param {Function} fn The function to call with `x`. The return value of `fn` will be thrown away.
* @param {*} x
* @return {*} `x`.
* @example
*
* var sayX = x => console.log('x is ' + x);
* R.tap(sayX, 100); //=> 100
* // logs 'x is 100'
* @symb R.tap(f, a) = a
*/
var tap = _curry2(function tap(fn, x) {
fn(x);
return x;
});
/**
* Calls an input function `n` times, returning an array containing the results
* of those function calls.
*
* `fn` is passed one argument: The current value of `n`, which begins at `0`
* and is gradually incremented to `n - 1`.
*
* @func
* @memberOf R
* @since v0.2.3
* @category List
* @sig (Number -> a) -> Number -> [a]
* @param {Function} fn The function to invoke. Passed one argument, the current value of `n`.
* @param {Number} n A value between `0` and `n - 1`. Increments after each function call.
* @return {Array} An array containing the return values of all calls to `fn`.
* @see R.repeat
* @example
*
* R.times(R.identity, 5); //=> [0, 1, 2, 3, 4]
* @symb R.times(f, 0) = []
* @symb R.times(f, 1) = [f(0)]
* @symb R.times(f, 2) = [f(0), f(1)]
*/
var times = _curry2(function times(fn, n) {
var len = Number(n);
var idx = 0;
var list;
if (len < 0 || isNaN(len)) {
throw new RangeError('n must be a non-negative number');
}
list = new Array(len);
while (idx < len) {
list[idx] = fn(idx);
idx += 1;
}
return list;
});
/**
* Converts an object into an array of key, value arrays. Only the object's
* own properties are used.
* Note that the order of the output array is not guaranteed to be consistent
* across different JS platforms.
*
* @func
* @memberOf R
* @since v0.4.0
* @category Object
* @sig {String: *} -> [[String,*]]
* @param {Object} obj The object to extract from
* @return {Array} An array of key, value arrays from the object's own properties.
* @see R.fromPairs
* @example
*
* R.toPairs({a: 1, b: 2, c: 3}); //=> [['a', 1], ['b', 2], ['c', 3]]
*/
var toPairs = _curry1(function toPairs(obj) {
var pairs = [];
for (var prop in obj) {
if (_has(prop, obj)) {
pairs[pairs.length] = [
prop,
obj[prop]
];
}
}
return pairs;
});
/**
* Converts an object into an array of key, value arrays. The object's own
* properties and prototype properties are used. Note that the order of the
* output array is not guaranteed to be consistent across different JS
* platforms.
*
* @func
* @memberOf R
* @since v0.4.0
* @category Object
* @sig {String: *} -> [[String,*]]
* @param {Object} obj The object to extract from
* @return {Array} An array of key, value arrays from the object's own
* and prototype properties.
* @example
*
* var F = function() { this.x = 'X'; };
* F.prototype.y = 'Y';
* var f = new F();
* R.toPairsIn(f); //=> [['x','X'], ['y','Y']]
*/
var toPairsIn = _curry1(function toPairsIn(obj) {
var pairs = [];
for (var prop in obj) {
pairs[pairs.length] = [
prop,
obj[prop]
];
}
return pairs;
});
/**
* Transposes the rows and columns of a 2D list.
* When passed a list of `n` lists of length `x`,
* returns a list of `x` lists of length `n`.
*
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig [[a]] -> [[a]]
* @param {Array} list A 2D list
* @return {Array} A 2D list
* @example
*
* R.transpose([[1, 'a'], [2, 'b'], [3, 'c']]) //=> [[1, 2, 3], ['a', 'b', 'c']]
* R.transpose([[1, 2, 3], ['a', 'b', 'c']]) //=> [[1, 'a'], [2, 'b'], [3, 'c']]
*
* // If some of the rows are shorter than the following rows, their elements are skipped:
* R.transpose([[10, 11], [20], [], [30, 31, 32]]) //=> [[10, 20, 30], [11, 31], [32]]
* @symb R.transpose([[a], [b], [c]]) = [a, b, c]
* @symb R.transpose([[a, b], [c, d]]) = [[a, c], [b, d]]
* @symb R.transpose([[a, b], [c]]) = [[a, c], [b]]
*/
var transpose = _curry1(function transpose(outerlist) {
var i = 0;
var result = [];
while (i < outerlist.length) {
var innerlist = outerlist[i];
var j = 0;
while (j < innerlist.length) {
if (typeof result[j] === 'undefined') {
result[j] = [];
}
result[j].push(innerlist[j]);
j += 1;
}
i += 1;
}
return result;
});
/**
* Removes (strips) whitespace from both ends of the string.
*
* @func
* @memberOf R
* @since v0.6.0
* @category String
* @sig String -> String
* @param {String} str The string to trim.
* @return {String} Trimmed version of `str`.
* @example
*
* R.trim(' xyz '); //=> 'xyz'
* R.map(R.trim, R.split(',', 'x, y, z')); //=> ['x', 'y', 'z']
*/
var trim = function () {
var ws = '\t\n\x0B\f\r \xA0\u1680\u180E\u2000\u2001\u2002\u2003' + '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028' + '\u2029\uFEFF';
var zeroWidth = '\u200B';
var hasProtoTrim = typeof String.prototype.trim === 'function';
if (!hasProtoTrim || (ws.trim() || !zeroWidth.trim())) {
return _curry1(function trim(str) {
var beginRx = new RegExp('^[' + ws + '][' + ws + ']*');
var endRx = new RegExp('[' + ws + '][' + ws + ']*$');
return str.replace(beginRx, '').replace(endRx, '');
});
} else {
return _curry1(function trim(str) {
return str.trim();
});
}
}();
/**
* `tryCatch` takes two functions, a `tryer` and a `catcher`. The returned
* function evaluates the `tryer`; if it does not throw, it simply returns the
* result. If the `tryer` *does* throw, the returned function evaluates the
* `catcher` function and returns its result. Note that for effective
* composition with this function, both the `tryer` and `catcher` functions
* must return the same type of results.
*
* @func
* @memberOf R
* @since v0.20.0
* @category Function
* @sig (...x -> a) -> ((e, ...x) -> a) -> (...x -> a)
* @param {Function} tryer The function that may throw.
* @param {Function} catcher The function that will be evaluated if `tryer` throws.
* @return {Function} A new function that will catch exceptions and send then to the catcher.
* @example
*
* R.tryCatch(R.prop('x'), R.F)({x: true}); //=> true
* R.tryCatch(R.prop('x'), R.F)(null); //=> false
*/
var tryCatch = _curry2(function _tryCatch(tryer, catcher) {
return _arity(tryer.length, function () {
try {
return tryer.apply(this, arguments);
} catch (e) {
return catcher.apply(this, _concat([e], arguments));
}
});
});
/**
* Gives a single-word string description of the (native) type of a value,
* returning such answers as 'Object', 'Number', 'Array', or 'Null'. Does not
* attempt to distinguish user Object types any further, reporting them all as
* 'Object'.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Type
* @sig (* -> {*}) -> String
* @param {*} val The value to test
* @return {String}
* @example
*
* R.type({}); //=> "Object"
* R.type(1); //=> "Number"
* R.type(false); //=> "Boolean"
* R.type('s'); //=> "String"
* R.type(null); //=> "Null"
* R.type([]); //=> "Array"
* R.type(/[A-z]/); //=> "RegExp"
* R.type(() => {}); //=> "Function"
*/
var type = _curry1(function type(val) {
return val === null ? 'Null' : val === undefined ? 'Undefined' : Object.prototype.toString.call(val).slice(8, -1);
});
/**
* Takes a function `fn`, which takes a single array argument, and returns a
* function which:
*
* - takes any number of positional arguments;
* - passes these arguments to `fn` as an array; and
* - returns the result.
*
* In other words, `R.unapply` derives a variadic function from a function which
* takes an array. `R.unapply` is the inverse of [`R.apply`](#apply).
*
* @func
* @memberOf R
* @since v0.8.0
* @category Function
* @sig ([*...] -> a) -> (*... -> a)
* @param {Function} fn
* @return {Function}
* @see R.apply
* @example
*
* R.unapply(JSON.stringify)(1, 2, 3); //=> '[1,2,3]'
* @symb R.unapply(f)(a, b) = f([a, b])
*/
var unapply = _curry1(function unapply(fn) {
return function () {
return fn(Array.prototype.slice.call(arguments, 0));
};
});
/**
* Wraps a function of any arity (including nullary) in a function that accepts
* exactly 1 parameter. Any extraneous parameters will not be passed to the
* supplied function.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Function
* @sig (* -> b) -> (a -> b)
* @param {Function} fn The function to wrap.
* @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
* arity 1.
* @see R.binary, R.nAry
* @example
*
* var takesTwoArgs = function(a, b) {
* return [a, b];
* };
* takesTwoArgs.length; //=> 2
* takesTwoArgs(1, 2); //=> [1, 2]
*
* var takesOneArg = R.unary(takesTwoArgs);
* takesOneArg.length; //=> 1
* // Only 1 argument is passed to the wrapped function
* takesOneArg(1, 2); //=> [1, undefined]
* @symb R.unary(f)(a, b, c) = f(a)
*/
var unary = _curry1(function unary(fn) {
return nAry(1, fn);
});
/**
* Returns a function of arity `n` from a (manually) curried function.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Function
* @sig Number -> (a -> b) -> (a -> c)
* @param {Number} length The arity for the returned function.
* @param {Function} fn The function to uncurry.
* @return {Function} A new function.
* @see R.curry
* @example
*
* var addFour = a => b => c => d => a + b + c + d;
*
* var uncurriedAddFour = R.uncurryN(4, addFour);
* uncurriedAddFour(1, 2, 3, 4); //=> 10
*/
var uncurryN = _curry2(function uncurryN(depth, fn) {
return curryN(depth, function () {
var currentDepth = 1;
var value = fn;
var idx = 0;
var endIdx;
while (currentDepth <= depth && typeof value === 'function') {
endIdx = currentDepth === depth ? arguments.length : idx + value.length;
value = value.apply(this, Array.prototype.slice.call(arguments, idx, endIdx));
currentDepth += 1;
idx = endIdx;
}
return value;
});
});
/**
* Builds a list from a seed value. Accepts an iterator function, which returns
* either false to stop iteration or an array of length 2 containing the value
* to add to the resulting list and the seed to be used in the next call to the
* iterator function.
*
* The iterator function receives one argument: *(seed)*.
*
* @func
* @memberOf R
* @since v0.10.0
* @category List
* @sig (a -> [b]) -> * -> [b]
* @param {Function} fn The iterator function. receives one argument, `seed`, and returns
* either false to quit iteration or an array of length two to proceed. The element
* at index 0 of this array will be added to the resulting array, and the element
* at index 1 will be passed to the next call to `fn`.
* @param {*} seed The seed value.
* @return {Array} The final list.
* @example
*
* var f = n => n > 50 ? false : [-n, n + 10];
* R.unfold(f, 10); //=> [-10, -20, -30, -40, -50]
* @symb R.unfold(f, x) = [f(x)[0], f(f(x)[1])[0], f(f(f(x)[1])[1])[0], ...]
*/
var unfold = _curry2(function unfold(fn, seed) {
var pair = fn(seed);
var result = [];
while (pair && pair.length) {
result[result.length] = pair[0];
pair = fn(pair[1]);
}
return result;
});
/**
* Returns a new list containing only one copy of each element in the original
* list, based upon the value returned by applying the supplied predicate to
* two list elements. Prefers the first item if two items compare equal based
* on the predicate.
*
* @func
* @memberOf R
* @since v0.2.0
* @category List
* @sig (a, a -> Boolean) -> [a] -> [a]
* @param {Function} pred A predicate used to test whether two items are equal.
* @param {Array} list The array to consider.
* @return {Array} The list of unique items.
* @example
*
* var strEq = R.eqBy(String);
* R.uniqWith(strEq)([1, '1', 2, 1]); //=> [1, 2]
* R.uniqWith(strEq)([{}, {}]); //=> [{}]
* R.uniqWith(strEq)([1, '1', 1]); //=> [1]
* R.uniqWith(strEq)(['1', 1, 1]); //=> ['1']
*/
var uniqWith = _curry2(function uniqWith(pred, list) {
var idx = 0;
var len = list.length;
var result = [];
var item;
while (idx < len) {
item = list[idx];
if (!_containsWith(pred, item, result)) {
result[result.length] = item;
}
idx += 1;
}
return result;
});
/**
* Tests the final argument by passing it to the given predicate function. If
* the predicate is not satisfied, the function will return the result of
* calling the `whenFalseFn` function with the same argument. If the predicate
* is satisfied, the argument is returned as is.
*
* @func
* @memberOf R
* @since v0.18.0
* @category Logic
* @sig (a -> Boolean) -> (a -> a) -> a -> a
* @param {Function} pred A predicate function
* @param {Function} whenFalseFn A function to invoke when the `pred` evaluates
* to a falsy value.
* @param {*} x An object to test with the `pred` function and
* pass to `whenFalseFn` if necessary.
* @return {*} Either `x` or the result of applying `x` to `whenFalseFn`.
* @see R.ifElse, R.when
* @example
*
* let safeInc = R.unless(R.isNil, R.inc);
* safeInc(null); //=> null
* safeInc(1); //=> 2
*/
var unless = _curry3(function unless(pred, whenFalseFn, x) {
return pred(x) ? x : whenFalseFn(x);
});
/**
* Takes a predicate, a transformation function, and an initial value,
* and returns a value of the same type as the initial value.
* It does so by applying the transformation until the predicate is satisfied,
* at which point it returns the satisfactory value.
*
* @func
* @memberOf R
* @since v0.20.0
* @category Logic
* @sig (a -> Boolean) -> (a -> a) -> a -> a
* @param {Function} pred A predicate function
* @param {Function} fn The iterator function
* @param {*} init Initial value
* @return {*} Final value that satisfies predicate
* @example
*
* R.until(R.gt(R.__, 100), R.multiply(2))(1) // => 128
*/
var until = _curry3(function until(pred, fn, init) {
var val = init;
while (!pred(val)) {
val = fn(val);
}
return val;
});
/**
* Returns a new copy of the array with the element at the provided index
* replaced with the given value.
*
* @func
* @memberOf R
* @since v0.14.0
* @category List
* @sig Number -> a -> [a] -> [a]
* @param {Number} idx The index to update.
* @param {*} x The value to exist at the given index of the returned array.
* @param {Array|Arguments} list The source array-like object to be updated.
* @return {Array} A copy of `list` with the value at index `idx` replaced with `x`.
* @see R.adjust
* @example
*
* R.update(1, 11, [0, 1, 2]); //=> [0, 11, 2]
* R.update(1)(11)([0, 1, 2]); //=> [0, 11, 2]
* @symb R.update(-1, a, [b, c]) = [b, a]
* @symb R.update(0, a, [b, c]) = [a, c]
* @symb R.update(1, a, [b, c]) = [b, a]
*/
var update = _curry3(function update(idx, x, list) {
return adjust(always(x), idx, list);
});
/**
* Accepts a function `fn` and a list of transformer functions and returns a
* new curried function. When the new function is invoked, it calls the
* function `fn` with parameters consisting of the result of calling each
* supplied handler on successive arguments to the new function.
*
* If more arguments are passed to the returned function than transformer
* functions, those arguments are passed directly to `fn` as additional
* parameters. If you expect additional arguments that don't need to be
* transformed, although you can ignore them, it's best to pass an identity
* function so that the new function reports the correct arity.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (x1 -> x2 -> ... -> z) -> [(a -> x1), (b -> x2), ...] -> (a -> b -> ... -> z)
* @param {Function} fn The function to wrap.
* @param {Array} transformers A list of transformer functions
* @return {Function} The wrapped function.
* @see R.converge
* @example
*
* R.useWith(Math.pow, [R.identity, R.identity])(3, 4); //=> 81
* R.useWith(Math.pow, [R.identity, R.identity])(3)(4); //=> 81
* R.useWith(Math.pow, [R.dec, R.inc])(3, 4); //=> 32
* R.useWith(Math.pow, [R.dec, R.inc])(3)(4); //=> 32
* @symb R.useWith(f, [g, h])(a, b) = f(g(a), h(b))
*/
var useWith = _curry2(function useWith(fn, transformers) {
return curryN(transformers.length, function () {
var args = [];
var idx = 0;
while (idx < transformers.length) {
args.push(transformers[idx].call(this, arguments[idx]));
idx += 1;
}
return fn.apply(this, args.concat(Array.prototype.slice.call(arguments, transformers.length)));
});
});
/**
* Returns a list of all the enumerable own properties of the supplied object.
* Note that the order of the output array is not guaranteed across different
* JS platforms.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig {k: v} -> [v]
* @param {Object} obj The object to extract values from
* @return {Array} An array of the values of the object's own properties.
* @see R.valuesIn, R.keys
* @example
*
* R.values({a: 1, b: 2, c: 3}); //=> [1, 2, 3]
*/
var values = _curry1(function values(obj) {
var props = keys(obj);
var len = props.length;
var vals = [];
var idx = 0;
while (idx < len) {
vals[idx] = obj[props[idx]];
idx += 1;
}
return vals;
});
/**
* Returns a list of all the properties, including prototype properties, of the
* supplied object.
* Note that the order of the output array is not guaranteed to be consistent
* across different JS platforms.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Object
* @sig {k: v} -> [v]
* @param {Object} obj The object to extract values from
* @return {Array} An array of the values of the object's own and prototype properties.
* @see R.values, R.keysIn
* @example
*
* var F = function() { this.x = 'X'; };
* F.prototype.y = 'Y';
* var f = new F();
* R.valuesIn(f); //=> ['X', 'Y']
*/
var valuesIn = _curry1(function valuesIn(obj) {
var prop;
var vs = [];
for (prop in obj) {
vs[vs.length] = obj[prop];
}
return vs;
});
/**
* Returns a "view" of the given data structure, determined by the given lens.
* The lens's focus determines which portion of the data structure is visible.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig Lens s a -> s -> a
* @param {Lens} lens
* @param {*} x
* @return {*}
* @see R.prop, R.lensIndex, R.lensProp
* @example
*
* var xLens = R.lensProp('x');
*
* R.view(xLens, {x: 1, y: 2}); //=> 1
* R.view(xLens, {x: 4, y: 2}); //=> 4
*/
// `Const` is a functor that effectively ignores the function given to `map`.
// Using `Const` effectively ignores the setter function of the `lens`,
// leaving the value returned by the getter function unmodified.
var view = function () {
// `Const` is a functor that effectively ignores the function given to `map`.
var Const = function (x) {
return {
value: x,
'fantasy-land/map': function () {
return this;
}
};
};
return _curry2(function view(lens, x) {
// Using `Const` effectively ignores the setter function of the `lens`,
// leaving the value returned by the getter function unmodified.
return lens(Const)(x).value;
});
}();
/**
* Tests the final argument by passing it to the given predicate function. If
* the predicate is satisfied, the function will return the result of calling
* the `whenTrueFn` function with the same argument. If the predicate is not
* satisfied, the argument is returned as is.
*
* @func
* @memberOf R
* @since v0.18.0
* @category Logic
* @sig (a -> Boolean) -> (a -> a) -> a -> a
* @param {Function} pred A predicate function
* @param {Function} whenTrueFn A function to invoke when the `condition`
* evaluates to a truthy value.
* @param {*} x An object to test with the `pred` function and
* pass to `whenTrueFn` if necessary.
* @return {*} Either `x` or the result of applying `x` to `whenTrueFn`.
* @see R.ifElse, R.unless
* @example
*
* // truncate :: String -> String
* var truncate = R.when(
* R.propSatisfies(R.gt(R.__, 10), 'length'),
* R.pipe(R.take(10), R.append('…'), R.join(''))
* );
* truncate('12345'); //=> '12345'
* truncate('0123456789ABC'); //=> '0123456789…'
*/
var when = _curry3(function when(pred, whenTrueFn, x) {
return pred(x) ? whenTrueFn(x) : x;
});
/**
* Takes a spec object and a test object; returns true if the test satisfies
* the spec. Each of the spec's own properties must be a predicate function.
* Each predicate is applied to the value of the corresponding property of the
* test object. `where` returns true if all the predicates return true, false
* otherwise.
*
* `where` is well suited to declaratively expressing constraints for other
* functions such as [`filter`](#filter) and [`find`](#find).
*
* @func
* @memberOf R
* @since v0.1.1
* @category Object
* @sig {String: (* -> Boolean)} -> {String: *} -> Boolean
* @param {Object} spec
* @param {Object} testObj
* @return {Boolean}
* @example
*
* // pred :: Object -> Boolean
* var pred = R.where({
* a: R.equals('foo'),
* b: R.complement(R.equals('bar')),
* x: R.gt(R.__, 10),
* y: R.lt(R.__, 20)
* });
*
* pred({a: 'foo', b: 'xxx', x: 11, y: 19}); //=> true
* pred({a: 'xxx', b: 'xxx', x: 11, y: 19}); //=> false
* pred({a: 'foo', b: 'bar', x: 11, y: 19}); //=> false
* pred({a: 'foo', b: 'xxx', x: 10, y: 19}); //=> false
* pred({a: 'foo', b: 'xxx', x: 11, y: 20}); //=> false
*/
var where = _curry2(function where(spec, testObj) {
for (var prop in spec) {
if (_has(prop, spec) && !spec[prop](testObj[prop])) {
return false;
}
}
return true;
});
/**
* Creates a new list out of the two supplied by creating each possible pair
* from the lists.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [b] -> [[a,b]]
* @param {Array} as The first list.
* @param {Array} bs The second list.
* @return {Array} The list made by combining each possible pair from
* `as` and `bs` into pairs (`[a, b]`).
* @example
*
* R.xprod([1, 2], ['a', 'b']); //=> [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
* @symb R.xprod([a, b], [c, d]) = [[a, c], [a, d], [b, c], [b, d]]
*/
// = xprodWith(prepend); (takes about 3 times as long...)
var xprod = _curry2(function xprod(a, b) {
// = xprodWith(prepend); (takes about 3 times as long...)
var idx = 0;
var ilen = a.length;
var j;
var jlen = b.length;
var result = [];
while (idx < ilen) {
j = 0;
while (j < jlen) {
result[result.length] = [
a[idx],
b[j]
];
j += 1;
}
idx += 1;
}
return result;
});
/**
* Creates a new list out of the two supplied by pairing up equally-positioned
* items from both lists. The returned list is truncated to the length of the
* shorter of the two input lists.
* Note: `zip` is equivalent to `zipWith(function(a, b) { return [a, b] })`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [b] -> [[a,b]]
* @param {Array} list1 The first array to consider.
* @param {Array} list2 The second array to consider.
* @return {Array} The list made by pairing up same-indexed elements of `list1` and `list2`.
* @example
*
* R.zip([1, 2, 3], ['a', 'b', 'c']); //=> [[1, 'a'], [2, 'b'], [3, 'c']]
* @symb R.zip([a, b, c], [d, e, f]) = [[a, d], [b, e], [c, f]]
*/
var zip = _curry2(function zip(a, b) {
var rv = [];
var idx = 0;
var len = Math.min(a.length, b.length);
while (idx < len) {
rv[idx] = [
a[idx],
b[idx]
];
idx += 1;
}
return rv;
});
/**
* Creates a new object out of a list of keys and a list of values.
* Key/value pairing is truncated to the length of the shorter of the two lists.
* Note: `zipObj` is equivalent to `pipe(zipWith(pair), fromPairs)`.
*
* @func
* @memberOf R
* @since v0.3.0
* @category List
* @sig [String] -> [*] -> {String: *}
* @param {Array} keys The array that will be properties on the output object.
* @param {Array} values The list of values on the output object.
* @return {Object} The object made by pairing up same-indexed elements of `keys` and `values`.
* @example
*
* R.zipObj(['a', 'b', 'c'], [1, 2, 3]); //=> {a: 1, b: 2, c: 3}
*/
var zipObj = _curry2(function zipObj(keys, values) {
var idx = 0;
var len = Math.min(keys.length, values.length);
var out = {};
while (idx < len) {
out[keys[idx]] = values[idx];
idx += 1;
}
return out;
});
/**
* Creates a new list out of the two supplied by applying the function to each
* equally-positioned pair in the lists. The returned list is truncated to the
* length of the shorter of the two input lists.
*
* @function
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a,b -> c) -> [a] -> [b] -> [c]
* @param {Function} fn The function used to combine the two elements into one value.
* @param {Array} list1 The first array to consider.
* @param {Array} list2 The second array to consider.
* @return {Array} The list made by combining same-indexed elements of `list1` and `list2`
* using `fn`.
* @example
*
* var f = (x, y) => {
* // ...
* };
* R.zipWith(f, [1, 2, 3], ['a', 'b', 'c']);
* //=> [f(1, 'a'), f(2, 'b'), f(3, 'c')]
* @symb R.zipWith(fn, [a, b, c], [d, e, f]) = [fn(a, d), fn(b, e), fn(c, f)]
*/
var zipWith = _curry3(function zipWith(fn, a, b) {
var rv = [];
var idx = 0;
var len = Math.min(a.length, b.length);
while (idx < len) {
rv[idx] = fn(a[idx], b[idx]);
idx += 1;
}
return rv;
});
/**
* A function that always returns `false`. Any passed in parameters are ignored.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Function
* @sig * -> Boolean
* @param {*}
* @return {Boolean}
* @see R.always, R.T
* @example
*
* R.F(); //=> false
*/
var F = always(false);
/**
* A function that always returns `true`. Any passed in parameters are ignored.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Function
* @sig * -> Boolean
* @param {*}
* @return {Boolean}
* @see R.always, R.F
* @example
*
* R.T(); //=> true
*/
var T = always(true);
/**
* Copies an object.
*
* @private
* @param {*} value The value to be copied
* @param {Array} refFrom Array containing the source references
* @param {Array} refTo Array containing the copied source references
* @param {Boolean} deep Whether or not to perform deep cloning.
* @return {*} The copied value.
*/
var _clone = function _clone(value, refFrom, refTo, deep) {
var copy = function copy(copiedValue) {
var len = refFrom.length;
var idx = 0;
while (idx < len) {
if (value === refFrom[idx]) {
return refTo[idx];
}
idx += 1;
}
refFrom[idx + 1] = value;
refTo[idx + 1] = copiedValue;
for (var key in value) {
copiedValue[key] = deep ? _clone(value[key], refFrom, refTo, true) : value[key];
}
return copiedValue;
};
switch (type(value)) {
case 'Object':
return copy({});
case 'Array':
return copy([]);
case 'Date':
return new Date(value.valueOf());
case 'RegExp':
return _cloneRegExp(value);
default:
return value;
}
};
var _createPartialApplicator = function _createPartialApplicator(concat) {
return _curry2(function (fn, args) {
return _arity(Math.max(0, fn.length - args.length), function () {
return fn.apply(this, concat(args, arguments));
});
});
};
var _dropLast = function dropLast(n, xs) {
return take(n < xs.length ? xs.length - n : 0, xs);
};
// Values of other types are only equal if identical.
var _equals = function _equals(a, b, stackA, stackB) {
if (identical(a, b)) {
return true;
}
if (type(a) !== type(b)) {
return false;
}
if (a == null || b == null) {
return false;
}
if (typeof a['fantasy-land/equals'] === 'function' || typeof b['fantasy-land/equals'] === 'function') {
return typeof a['fantasy-land/equals'] === 'function' && a['fantasy-land/equals'](b) && typeof b['fantasy-land/equals'] === 'function' && b['fantasy-land/equals'](a);
}
if (typeof a.equals === 'function' || typeof b.equals === 'function') {
return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);
}
switch (type(a)) {
case 'Arguments':
case 'Array':
case 'Object':
if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {
return a === b;
}
break;
case 'Boolean':
case 'Number':
case 'String':
if (!(typeof a === typeof b && identical(a.valueOf(), b.valueOf()))) {
return false;
}
break;
case 'Date':
if (!identical(a.valueOf(), b.valueOf())) {
return false;
}
break;
case 'Error':
return a.name === b.name && a.message === b.message;
case 'RegExp':
if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {
return false;
}
break;
case 'Map':
case 'Set':
if (!_equals(_arrayFromIterator(a.entries()), _arrayFromIterator(b.entries()), stackA, stackB)) {
return false;
}
break;
case 'Int8Array':
case 'Uint8Array':
case 'Uint8ClampedArray':
case 'Int16Array':
case 'Uint16Array':
case 'Int32Array':
case 'Uint32Array':
case 'Float32Array':
case 'Float64Array':
break;
case 'ArrayBuffer':
break;
default:
// Values of other types are only equal if identical.
return false;
}
var keysA = keys(a);
if (keysA.length !== keys(b).length) {
return false;
}
var idx = stackA.length - 1;
while (idx >= 0) {
if (stackA[idx] === a) {
return stackB[idx] === b;
}
idx -= 1;
}
stackA.push(a);
stackB.push(b);
idx = keysA.length - 1;
while (idx >= 0) {
var key = keysA[idx];
if (!(_has(key, b) && _equals(b[key], a[key], stackA, stackB))) {
return false;
}
idx -= 1;
}
stackA.pop();
stackB.pop();
return true;
};
var _reduce = function () {
function _arrayReduce(xf, acc, list) {
var idx = 0;
var len = list.length;
while (idx < len) {
acc = xf['@@transducer/step'](acc, list[idx]);
if (acc && acc['@@transducer/reduced']) {
acc = acc['@@transducer/value'];
break;
}
idx += 1;
}
return xf['@@transducer/result'](acc);
}
function _iterableReduce(xf, acc, iter) {
var step = iter.next();
while (!step.done) {
acc = xf['@@transducer/step'](acc, step.value);
if (acc && acc['@@transducer/reduced']) {
acc = acc['@@transducer/value'];
break;
}
step = iter.next();
}
return xf['@@transducer/result'](acc);
}
function _methodReduce(xf, acc, obj, methodName) {
return xf['@@transducer/result'](obj[methodName](bind(xf['@@transducer/step'], xf), acc));
}
var symIterator = typeof Symbol !== 'undefined' ? Symbol.iterator : '@@iterator';
return function _reduce(fn, acc, list) {
if (typeof fn === 'function') {
fn = _xwrap(fn);
}
if (_isArrayLike(list)) {
return _arrayReduce(fn, acc, list);
}
if (typeof list['fantasy-land/reduce'] === 'function') {
return _methodReduce(fn, acc, list, 'fantasy-land/reduce');
}
if (list[symIterator] != null) {
return _iterableReduce(fn, acc, list[symIterator]());
}
if (typeof list.next === 'function') {
return _iterableReduce(fn, acc, list);
}
if (typeof list.reduce === 'function') {
return _methodReduce(fn, acc, list, 'reduce');
}
throw new TypeError('reduce: list must be array or iterable');
};
}();
var _stepCat = function () {
var _stepCatArray = {
'@@transducer/init': Array,
'@@transducer/step': function (xs, x) {
xs.push(x);
return xs;
},
'@@transducer/result': _identity
};
var _stepCatString = {
'@@transducer/init': String,
'@@transducer/step': function (a, b) {
return a + b;
},
'@@transducer/result': _identity
};
var _stepCatObject = {
'@@transducer/init': Object,
'@@transducer/step': function (result, input) {
return _assign(result, _isArrayLike(input) ? objOf(input[0], input[1]) : input);
},
'@@transducer/result': _identity
};
return function _stepCat(obj) {
if (_isTransformer(obj)) {
return obj;
}
if (_isArrayLike(obj)) {
return _stepCatArray;
}
if (typeof obj === 'string') {
return _stepCatString;
}
if (typeof obj === 'object') {
return _stepCatObject;
}
throw new Error('Cannot create transformer for ' + obj);
};
}();
var _xdropLastWhile = function () {
function XDropLastWhile(fn, xf) {
this.f = fn;
this.retained = [];
this.xf = xf;
}
XDropLastWhile.prototype['@@transducer/init'] = _xfBase.init;
XDropLastWhile.prototype['@@transducer/result'] = function (result) {
this.retained = null;
return this.xf['@@transducer/result'](result);
};
XDropLastWhile.prototype['@@transducer/step'] = function (result, input) {
return this.f(input) ? this.retain(result, input) : this.flush(result, input);
};
XDropLastWhile.prototype.flush = function (result, input) {
result = _reduce(this.xf['@@transducer/step'], result, this.retained);
this.retained = [];
return this.xf['@@transducer/step'](result, input);
};
XDropLastWhile.prototype.retain = function (result, input) {
this.retained.push(input);
return result;
};
return _curry2(function _xdropLastWhile(fn, xf) {
return new XDropLastWhile(fn, xf);
});
}();
/**
* Creates a new list iteration function from an existing one by adding two new
* parameters to its callback function: the current index, and the entire list.
*
* This would turn, for instance, [`R.map`](#map) function into one that
* more closely resembles `Array.prototype.map`. Note that this will only work
* for functions in which the iteration callback function is the first
* parameter, and where the list is the last parameter. (This latter might be
* unimportant if the list parameter is not used.)
*
* @func
* @memberOf R
* @since v0.15.0
* @category Function
* @category List
* @sig ((a ... -> b) ... -> [a] -> *) -> (a ..., Int, [a] -> b) ... -> [a] -> *)
* @param {Function} fn A list iteration function that does not pass index or list to its callback
* @return {Function} An altered list iteration function that passes (item, index, list) to its callback
* @example
*
* var mapIndexed = R.addIndex(R.map);
* mapIndexed((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']);
* //=> ['0-f', '1-o', '2-o', '3-b', '4-a', '5-r']
*/
var addIndex = _curry1(function addIndex(fn) {
return curryN(fn.length, function () {
var idx = 0;
var origFn = arguments[0];
var list = arguments[arguments.length - 1];
var args = Array.prototype.slice.call(arguments, 0);
args[0] = function () {
var result = origFn.apply(this, _concat(arguments, [
idx,
list
]));
idx += 1;
return result;
};
return fn.apply(this, args);
});
});
/**
* Makes a shallow clone of an object, setting or overriding the nodes required
* to create the given path, and placing the specific value at the tail end of
* that path. Note that this copies and flattens prototype properties onto the
* new object as well. All non-primitive properties are copied by reference.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Object
* @typedefn Idx = String | Int
* @sig [Idx] -> a -> {a} -> {a}
* @param {Array} path the path to set
* @param {*} val The new value
* @param {Object} obj The object to clone
* @return {Object} A new object equivalent to the original except along the specified path.
* @see R.dissocPath
* @example
*
* R.assocPath(['a', 'b', 'c'], 42, {a: {b: {c: 0}}}); //=> {a: {b: {c: 42}}}
*
* // Any missing or non-object keys in path will be overridden
* R.assocPath(['a', 'b', 'c'], 42, {a: 5}); //=> {a: {b: {c: 42}}}
*/
var assocPath = _curry3(function assocPath(path, val, obj) {
if (path.length === 0) {
return val;
}
var idx = path[0];
if (path.length > 1) {
var nextObj = !isNil(obj) && _has(idx, obj) ? obj[idx] : _isInteger(path[1]) ? [] : {};
val = assocPath(Array.prototype.slice.call(path, 1), val, nextObj);
}
if (_isInteger(idx) && _isArray(obj)) {
var arr = [].concat(obj);
arr[idx] = val;
return arr;
} else {
return assoc(idx, val, obj);
}
});
/**
* Wraps a function of any arity (including nullary) in a function that accepts
* exactly 2 parameters. Any extraneous parameters will not be passed to the
* supplied function.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Function
* @sig (* -> c) -> (a, b -> c)
* @param {Function} fn The function to wrap.
* @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
* arity 2.
* @see R.nAry, R.unary
* @example
*
* var takesThreeArgs = function(a, b, c) {
* return [a, b, c];
* };
* takesThreeArgs.length; //=> 3
* takesThreeArgs(1, 2, 3); //=> [1, 2, 3]
*
* var takesTwoArgs = R.binary(takesThreeArgs);
* takesTwoArgs.length; //=> 2
* // Only 2 arguments are passed to the wrapped function
* takesTwoArgs(1, 2, 3); //=> [1, 2, undefined]
* @symb R.binary(f)(a, b, c) = f(a, b)
*/
var binary = _curry1(function binary(fn) {
return nAry(2, fn);
});
/**
* Creates a deep copy of the value which may contain (nested) `Array`s and
* `Object`s, `Number`s, `String`s, `Boolean`s and `Date`s. `Function`s are
* assigned by reference rather than copied
*
* Dispatches to a `clone` method if present.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig {*} -> {*}
* @param {*} value The object or array to clone
* @return {*} A deeply cloned copy of `val`
* @example
*
* var objects = [{}, {}, {}];
* var objectsClone = R.clone(objects);
* objects === objectsClone; //=> false
* objects[0] === objectsClone[0]; //=> false
*/
var clone = _curry1(function clone(value) {
return value != null && typeof value.clone === 'function' ? value.clone() : _clone(value, [], [], true);
});
/**
* Returns a curried equivalent of the provided function. The curried function
* has two unusual capabilities. First, its arguments needn't be provided one
* at a time. If `f` is a ternary function and `g` is `R.curry(f)`, the
* following are equivalent:
*
* - `g(1)(2)(3)`
* - `g(1)(2, 3)`
* - `g(1, 2)(3)`
* - `g(1, 2, 3)`
*
* Secondly, the special placeholder value [`R.__`](#__) may be used to specify
* "gaps", allowing partial application of any combination of arguments,
* regardless of their positions. If `g` is as above and `_` is [`R.__`](#__),
* the following are equivalent:
*
* - `g(1, 2, 3)`
* - `g(_, 2, 3)(1)`
* - `g(_, _, 3)(1)(2)`
* - `g(_, _, 3)(1, 2)`
* - `g(_, 2)(1)(3)`
* - `g(_, 2)(1, 3)`
* - `g(_, 2)(_, 3)(1)`
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (* -> a) -> (* -> a)
* @param {Function} fn The function to curry.
* @return {Function} A new, curried function.
* @see R.curryN
* @example
*
* var addFourNumbers = (a, b, c, d) => a + b + c + d;
*
* var curriedAddFourNumbers = R.curry(addFourNumbers);
* var f = curriedAddFourNumbers(1, 2);
* var g = f(3);
* g(4); //=> 10
*/
var curry = _curry1(function curry(fn) {
return curryN(fn.length, fn);
});
/**
* Makes a shallow clone of an object, omitting the property at the given path.
* Note that this copies and flattens prototype properties onto the new object
* as well. All non-primitive properties are copied by reference.
*
* @func
* @memberOf R
* @since v0.11.0
* @category Object
* @typedefn Idx = String | Int
* @sig [Idx] -> {k: v} -> {k: v}
* @param {Array} path The path to the value to omit
* @param {Object} obj The object to clone
* @return {Object} A new object without the property at path
* @see R.assocPath
* @example
*
* R.dissocPath(['a', 'b', 'c'], {a: {b: {c: 42}}}); //=> {a: {b: {}}}
*/
var dissocPath = _curry2(function dissocPath(path, obj) {
switch (path.length) {
case 0:
return obj;
case 1:
return _isInteger(path[0]) ? remove(path[0], 1, obj) : dissoc(path[0], obj);
default:
var head = path[0];
var tail = Array.prototype.slice.call(path, 1);
if (obj[head] == null) {
return obj;
} else if (_isInteger(path[0])) {
return update(head, dissocPath(tail, obj[head]), obj);
} else {
return assoc(head, dissocPath(tail, obj[head]), obj);
}
}
});
/**
* Returns all but the first `n` elements of the given list, string, or
* transducer/transformer (or object with a `drop` method).
*
* Dispatches to the `drop` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Number -> [a] -> [a]
* @sig Number -> String -> String
* @param {Number} n
* @param {*} list
* @return {*} A copy of list without the first `n` elements
* @see R.take, R.transduce, R.dropLast, R.dropWhile
* @example
*
* R.drop(1, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']
* R.drop(2, ['foo', 'bar', 'baz']); //=> ['baz']
* R.drop(3, ['foo', 'bar', 'baz']); //=> []
* R.drop(4, ['foo', 'bar', 'baz']); //=> []
* R.drop(3, 'ramda'); //=> 'da'
*/
var drop = _curry2(_dispatchable(['drop'], _xdrop, function drop(n, xs) {
return slice(Math.max(0, n), Infinity, xs);
}));
/**
* Returns a list containing all but the last `n` elements of the given `list`.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig Number -> [a] -> [a]
* @sig Number -> String -> String
* @param {Number} n The number of elements of `list` to skip.
* @param {Array} list The list of elements to consider.
* @return {Array} A copy of the list with only the first `list.length - n` elements
* @see R.takeLast, R.drop, R.dropWhile, R.dropLastWhile
* @example
*
* R.dropLast(1, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']
* R.dropLast(2, ['foo', 'bar', 'baz']); //=> ['foo']
* R.dropLast(3, ['foo', 'bar', 'baz']); //=> []
* R.dropLast(4, ['foo', 'bar', 'baz']); //=> []
* R.dropLast(3, 'ramda'); //=> 'ra'
*/
var dropLast = _curry2(_dispatchable([], _xdropLast, _dropLast));
/**
* Returns a new list excluding all the tailing elements of a given list which
* satisfy the supplied predicate function. It passes each value from the right
* to the supplied predicate function, skipping elements until the predicate
* function returns a `falsy` value. The predicate function is applied to one argument:
* *(value)*.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig (a -> Boolean) -> [a] -> [a]
* @param {Function} predicate The function to be called on each element
* @param {Array} list The collection to iterate over.
* @return {Array} A new array without any trailing elements that return `falsy` values from the `predicate`.
* @see R.takeLastWhile, R.addIndex, R.drop, R.dropWhile
* @example
*
* var lteThree = x => x <= 3;
*
* R.dropLastWhile(lteThree, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3, 4]
*/
var dropLastWhile = _curry2(_dispatchable([], _xdropLastWhile, _dropLastWhile));
/**
* Returns `true` if its arguments are equivalent, `false` otherwise. Handles
* cyclical data structures.
*
* Dispatches symmetrically to the `equals` methods of both arguments, if
* present.
*
* @func
* @memberOf R
* @since v0.15.0
* @category Relation
* @sig a -> b -> Boolean
* @param {*} a
* @param {*} b
* @return {Boolean}
* @example
*
* R.equals(1, 1); //=> true
* R.equals(1, '1'); //=> false
* R.equals([1, 2, 3], [1, 2, 3]); //=> true
*
* var a = {}; a.v = a;
* var b = {}; b.v = b;
* R.equals(a, b); //=> true
*/
var equals = _curry2(function equals(a, b) {
return _equals(a, b, [], []);
});
/**
* Takes a predicate and a `Filterable`, and returns a new filterable of the
* same type containing the members of the given filterable which satisfy the
* given predicate. Filterable objects include plain objects or any object
* that has a filter method such as `Array`.
*
* Dispatches to the `filter` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Filterable f => (a -> Boolean) -> f a -> f a
* @param {Function} pred
* @param {Array} filterable
* @return {Array} Filterable
* @see R.reject, R.transduce, R.addIndex
* @example
*
* var isEven = n => n % 2 === 0;
*
* R.filter(isEven, [1, 2, 3, 4]); //=> [2, 4]
*
* R.filter(isEven, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}
*/
// else
var filter = _curry2(_dispatchable(['filter'], _xfilter, function (pred, filterable) {
return _isObject(filterable) ? _reduce(function (acc, key) {
if (pred(filterable[key])) {
acc[key] = filterable[key];
}
return acc;
}, {}, keys(filterable)) : // else
_filter(pred, filterable);
}));
/**
* Returns a new function much like the supplied one, except that the first two
* arguments' order is reversed.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a -> b -> c -> ... -> z) -> (b -> a -> c -> ... -> z)
* @param {Function} fn The function to invoke with its first two parameters reversed.
* @return {*} The result of invoking `fn` with its first two parameters' order reversed.
* @example
*
* var mergeThree = (a, b, c) => [].concat(a, b, c);
*
* mergeThree(1, 2, 3); //=> [1, 2, 3]
*
* R.flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]
* @symb R.flip(f)(a, b, c) = f(b, a, c)
*/
var flip = _curry1(function flip(fn) {
return curry(function (a, b) {
var args = Array.prototype.slice.call(arguments, 0);
args[0] = b;
args[1] = a;
return fn.apply(this, args);
});
});
/**
* Iterate over an input `object`, calling a provided function `fn` for each
* key and value in the object.
*
* `fn` receives three argument: *(value, key, obj)*.
*
* @func
* @memberOf R
* @since v0.23.0
* @category Object
* @sig ((a, String, StrMap a) -> Any) -> StrMap a -> StrMap a
* @param {Function} fn The function to invoke. Receives three argument, `value`, `key`, `obj`.
* @param {Object} obj The object to iterate over.
* @return {Object} The original object.
* @example
*
* var printKeyConcatValue = (value, key) => console.log(key + ':' + value);
* R.forEachObjIndexed(printKeyConcatValue, {x: 1, y: 2}); //=> {x: 1, y: 2}
* // logs x:1
* // logs y:2
* @symb R.forEachObjIndexed(f, {x: a, y: b}) = {x: a, y: b}
*/
var forEachObjIndexed = _curry2(function forEachObjIndexed(fn, obj) {
var keyList = keys(obj);
var idx = 0;
while (idx < keyList.length) {
var key = keyList[idx];
fn(obj[key], key, obj);
idx += 1;
}
return obj;
});
/**
* Returns the first element of the given list or string. In some libraries
* this function is named `first`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> a | Undefined
* @sig String -> String
* @param {Array|String} list
* @return {*}
* @see R.tail, R.init, R.last
* @example
*
* R.head(['fi', 'fo', 'fum']); //=> 'fi'
* R.head([]); //=> undefined
*
* R.head('abc'); //=> 'a'
* R.head(''); //=> ''
*/
var head = nth(0);
/**
* Returns all but the last element of the given list or string.
*
* @func
* @memberOf R
* @since v0.9.0
* @category List
* @sig [a] -> [a]
* @sig String -> String
* @param {*} list
* @return {*}
* @see R.last, R.head, R.tail
* @example
*
* R.init([1, 2, 3]); //=> [1, 2]
* R.init([1, 2]); //=> [1]
* R.init([1]); //=> []
* R.init([]); //=> []
*
* R.init('abc'); //=> 'ab'
* R.init('ab'); //=> 'a'
* R.init('a'); //=> ''
* R.init(''); //=> ''
*/
var init = slice(0, -1);
/**
* Combines two lists into a set (i.e. no duplicates) composed of those
* elements common to both lists. Duplication is determined according to the
* value returned by applying the supplied predicate to two list elements.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig ((a, a) -> Boolean) -> [a] -> [a] -> [a]
* @param {Function} pred A predicate function that determines whether
* the two supplied elements are equal.
* @param {Array} list1 One list of items to compare
* @param {Array} list2 A second list of items to compare
* @return {Array} A new list containing those elements common to both lists.
* @see R.innerJoin
* @deprecated since v0.24.0
* @example
*
* var buffaloSpringfield = [
* {id: 824, name: 'Richie Furay'},
* {id: 956, name: 'Dewey Martin'},
* {id: 313, name: 'Bruce Palmer'},
* {id: 456, name: 'Stephen Stills'},
* {id: 177, name: 'Neil Young'}
* ];
* var csny = [
* {id: 204, name: 'David Crosby'},
* {id: 456, name: 'Stephen Stills'},
* {id: 539, name: 'Graham Nash'},
* {id: 177, name: 'Neil Young'}
* ];
*
* R.intersectionWith(R.eqBy(R.prop('id')), buffaloSpringfield, csny);
* //=> [{id: 456, name: 'Stephen Stills'}, {id: 177, name: 'Neil Young'}]
*/
var intersectionWith = _curry3(function intersectionWith(pred, list1, list2) {
var lookupList, filteredList;
if (list1.length > list2.length) {
lookupList = list1;
filteredList = list2;
} else {
lookupList = list2;
filteredList = list1;
}
var results = [];
var idx = 0;
while (idx < filteredList.length) {
if (_containsWith(pred, filteredList[idx], lookupList)) {
results[results.length] = filteredList[idx];
}
idx += 1;
}
return uniqWith(pred, results);
});
/**
* Transforms the items of the list with the transducer and appends the
* transformed items to the accumulator using an appropriate iterator function
* based on the accumulator type.
*
* The accumulator can be an array, string, object or a transformer. Iterated
* items will be appended to arrays and concatenated to strings. Objects will
* be merged directly or 2-item arrays will be merged as key, value pairs.
*
* The accumulator can also be a transformer object that provides a 2-arity
* reducing iterator function, step, 0-arity initial value function, init, and
* 1-arity result extraction function result. The step function is used as the
* iterator function in reduce. The result function is used to convert the
* final accumulator into the return type and in most cases is R.identity. The
* init function is used to provide the initial accumulator.
*
* The iteration is performed with [`R.reduce`](#reduce) after initializing the
* transducer.
*
* @func
* @memberOf R
* @since v0.12.0
* @category List
* @sig a -> (b -> b) -> [c] -> a
* @param {*} acc The initial accumulator value.
* @param {Function} xf The transducer function. Receives a transformer and returns a transformer.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @example
*
* var numbers = [1, 2, 3, 4];
* var transducer = R.compose(R.map(R.add(1)), R.take(2));
*
* R.into([], transducer, numbers); //=> [2, 3]
*
* var intoArray = R.into([]);
* intoArray(transducer, numbers); //=> [2, 3]
*/
var into = _curry3(function into(acc, xf, list) {
return _isTransformer(acc) ? _reduce(xf(acc), acc['@@transducer/init'](), list) : _reduce(xf(_stepCat(acc)), _clone(acc, [], [], false), list);
});
/**
* Same as [`R.invertObj`](#invertObj), however this accounts for objects with
* duplicate values by putting the values into an array.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Object
* @sig {s: x} -> {x: [ s, ... ]}
* @param {Object} obj The object or array to invert
* @return {Object} out A new object with keys in an array.
* @see R.invertObj
* @example
*
* var raceResultsByFirstName = {
* first: 'alice',
* second: 'jake',
* third: 'alice',
* };
* R.invert(raceResultsByFirstName);
* //=> { 'alice': ['first', 'third'], 'jake':['second'] }
*/
var invert = _curry1(function invert(obj) {
var props = keys(obj);
var len = props.length;
var idx = 0;
var out = {};
while (idx < len) {
var key = props[idx];
var val = obj[key];
var list = _has(val, out) ? out[val] : out[val] = [];
list[list.length] = key;
idx += 1;
}
return out;
});
/**
* Returns a new object with the keys of the given object as values, and the
* values of the given object, which are coerced to strings, as keys. Note
* that the last key found is preferred when handling the same value.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Object
* @sig {s: x} -> {x: s}
* @param {Object} obj The object or array to invert
* @return {Object} out A new object
* @see R.invert
* @example
*
* var raceResults = {
* first: 'alice',
* second: 'jake'
* };
* R.invertObj(raceResults);
* //=> { 'alice': 'first', 'jake':'second' }
*
* // Alternatively:
* var raceResults = ['alice', 'jake'];
* R.invertObj(raceResults);
* //=> { 'alice': '0', 'jake':'1' }
*/
var invertObj = _curry1(function invertObj(obj) {
var props = keys(obj);
var len = props.length;
var idx = 0;
var out = {};
while (idx < len) {
var key = props[idx];
out[obj[key]] = key;
idx += 1;
}
return out;
});
/**
* Returns `true` if the given value is its type's empty value; `false`
* otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Logic
* @sig a -> Boolean
* @param {*} x
* @return {Boolean}
* @see R.empty
* @example
*
* R.isEmpty([1, 2, 3]); //=> false
* R.isEmpty([]); //=> true
* R.isEmpty(''); //=> true
* R.isEmpty(null); //=> false
* R.isEmpty({}); //=> true
* R.isEmpty({length: 0}); //=> false
*/
var isEmpty = _curry1(function isEmpty(x) {
return x != null && equals(x, empty(x));
});
/**
* Returns the last element of the given list or string.
*
* @func
* @memberOf R
* @since v0.1.4
* @category List
* @sig [a] -> a | Undefined
* @sig String -> String
* @param {*} list
* @return {*}
* @see R.init, R.head, R.tail
* @example
*
* R.last(['fi', 'fo', 'fum']); //=> 'fum'
* R.last([]); //=> undefined
*
* R.last('abc'); //=> 'c'
* R.last(''); //=> ''
*/
var last = nth(-1);
/**
* Returns the position of the last occurrence of an item in an array, or -1 if
* the item is not included in the array. [`R.equals`](#equals) is used to
* determine equality.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig a -> [a] -> Number
* @param {*} target The item to find.
* @param {Array} xs The array to search in.
* @return {Number} the index of the target, or -1 if the target is not found.
* @see R.indexOf
* @example
*
* R.lastIndexOf(3, [-1,3,3,0,1,2,3,4]); //=> 6
* R.lastIndexOf(10, [1,2,3,4]); //=> -1
*/
var lastIndexOf = _curry2(function lastIndexOf(target, xs) {
if (typeof xs.lastIndexOf === 'function' && !_isArray(xs)) {
return xs.lastIndexOf(target);
} else {
var idx = xs.length - 1;
while (idx >= 0) {
if (equals(xs[idx], target)) {
return idx;
}
idx -= 1;
}
return -1;
}
});
/**
* Takes a function and
* a [functor](https://github.com/fantasyland/fantasy-land#functor),
* applies the function to each of the functor's values, and returns
* a functor of the same shape.
*
* Ramda provides suitable `map` implementations for `Array` and `Object`,
* so this function may be applied to `[1, 2, 3]` or `{x: 1, y: 2, z: 3}`.
*
* Dispatches to the `map` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* Also treats functions as functors and will compose them together.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Functor f => (a -> b) -> f a -> f b
* @param {Function} fn The function to be called on every element of the input `list`.
* @param {Array} list The list to be iterated over.
* @return {Array} The new list.
* @see R.transduce, R.addIndex
* @example
*
* var double = x => x * 2;
*
* R.map(double, [1, 2, 3]); //=> [2, 4, 6]
*
* R.map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}
* @symb R.map(f, [a, b]) = [f(a), f(b)]
* @symb R.map(f, { x: a, y: b }) = { x: f(a), y: f(b) }
* @symb R.map(f, functor_o) = functor_o.map(f)
*/
var map = _curry2(_dispatchable([
'fantasy-land/map',
'map'
], _xmap, function map(fn, functor) {
switch (Object.prototype.toString.call(functor)) {
case '[object Function]':
return curryN(functor.length, function () {
return fn.call(this, functor.apply(this, arguments));
});
case '[object Object]':
return _reduce(function (acc, key) {
acc[key] = fn(functor[key]);
return acc;
}, {}, keys(functor));
default:
return _map(fn, functor);
}
}));
/**
* An Object-specific version of [`map`](#map). The function is applied to three
* arguments: *(value, key, obj)*. If only the value is significant, use
* [`map`](#map) instead.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Object
* @sig ((*, String, Object) -> *) -> Object -> Object
* @param {Function} fn
* @param {Object} obj
* @return {Object}
* @see R.map
* @example
*
* var values = { x: 1, y: 2, z: 3 };
* var prependKeyAndDouble = (num, key, obj) => key + (num * 2);
*
* R.mapObjIndexed(prependKeyAndDouble, values); //=> { x: 'x2', y: 'y4', z: 'z6' }
*/
var mapObjIndexed = _curry2(function mapObjIndexed(fn, obj) {
return _reduce(function (acc, key) {
acc[key] = fn(obj[key], key, obj);
return acc;
}, {}, keys(obj));
});
/**
* Creates a new object with the own properties of the two provided objects.
* If a key exists in both objects:
* - and both associated values are also objects then the values will be
* recursively merged.
* - otherwise the provided function is applied to the key and associated values
* using the resulting value as the new value associated with the key.
* If a key only exists in one object, the value will be associated with the key
* of the resulting object.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Object
* @sig (String -> a -> a -> a) -> {a} -> {a} -> {a}
* @param {Function} fn
* @param {Object} lObj
* @param {Object} rObj
* @return {Object}
* @see R.mergeWithKey, R.mergeDeep, R.mergeDeepWith
* @example
*
* let concatValues = (k, l, r) => k == 'values' ? R.concat(l, r) : r
* R.mergeDeepWithKey(concatValues,
* { a: true, c: { thing: 'foo', values: [10, 20] }},
* { b: true, c: { thing: 'bar', values: [15, 35] }});
* //=> { a: true, b: true, c: { thing: 'bar', values: [10, 20, 15, 35] }}
*/
var mergeDeepWithKey = _curry3(function mergeDeepWithKey(fn, lObj, rObj) {
return mergeWithKey(function (k, lVal, rVal) {
if (_isObject(lVal) && _isObject(rVal)) {
return mergeDeepWithKey(fn, lVal, rVal);
} else {
return fn(k, lVal, rVal);
}
}, lObj, rObj);
});
/**
* Creates a new object with the own properties of the two provided objects. If
* a key exists in both objects, the provided function is applied to the values
* associated with the key in each object, with the result being used as the
* value associated with the key in the returned object.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Object
* @sig (a -> a -> a) -> {a} -> {a} -> {a}
* @param {Function} fn
* @param {Object} l
* @param {Object} r
* @return {Object}
* @see R.mergeDeepWith, R.merge, R.mergeWithKey
* @example
*
* R.mergeWith(R.concat,
* { a: true, values: [10, 20] },
* { b: true, values: [15, 35] });
* //=> { a: true, b: true, values: [10, 20, 15, 35] }
*/
var mergeWith = _curry3(function mergeWith(fn, l, r) {
return mergeWithKey(function (_, _l, _r) {
return fn(_l, _r);
}, l, r);
});
/**
* Takes a function `f` and a list of arguments, and returns a function `g`.
* When applied, `g` returns the result of applying `f` to the arguments
* provided initially followed by the arguments provided to `g`.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Function
* @sig ((a, b, c, ..., n) -> x) -> [a, b, c, ...] -> ((d, e, f, ..., n) -> x)
* @param {Function} f
* @param {Array} args
* @return {Function}
* @see R.partialRight
* @example
*
* var multiply2 = (a, b) => a * b;
* var double = R.partial(multiply2, [2]);
* double(2); //=> 4
*
* var greet = (salutation, title, firstName, lastName) =>
* salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';
*
* var sayHello = R.partial(greet, ['Hello']);
* var sayHelloToMs = R.partial(sayHello, ['Ms.']);
* sayHelloToMs('Jane', 'Jones'); //=> 'Hello, Ms. Jane Jones!'
* @symb R.partial(f, [a, b])(c, d) = f(a, b, c, d)
*/
var partial = _createPartialApplicator(_concat);
/**
* Takes a function `f` and a list of arguments, and returns a function `g`.
* When applied, `g` returns the result of applying `f` to the arguments
* provided to `g` followed by the arguments provided initially.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Function
* @sig ((a, b, c, ..., n) -> x) -> [d, e, f, ..., n] -> ((a, b, c, ...) -> x)
* @param {Function} f
* @param {Array} args
* @return {Function}
* @see R.partial
* @example
*
* var greet = (salutation, title, firstName, lastName) =>
* salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';
*
* var greetMsJaneJones = R.partialRight(greet, ['Ms.', 'Jane', 'Jones']);
*
* greetMsJaneJones('Hello'); //=> 'Hello, Ms. Jane Jones!'
* @symb R.partialRight(f, [a, b])(c, d) = f(c, d, a, b)
*/
var partialRight = _createPartialApplicator(flip(_concat));
/**
* Determines whether a nested path on an object has a specific value, in
* [`R.equals`](#equals) terms. Most likely used to filter a list.
*
* @func
* @memberOf R
* @since v0.7.0
* @category Relation
* @typedefn Idx = String | Int
* @sig [Idx] -> a -> {a} -> Boolean
* @param {Array} path The path of the nested property to use
* @param {*} val The value to compare the nested property with
* @param {Object} obj The object to check the nested property in
* @return {Boolean} `true` if the value equals the nested object property,
* `false` otherwise.
* @example
*
* var user1 = { address: { zipCode: 90210 } };
* var user2 = { address: { zipCode: 55555 } };
* var user3 = { name: 'Bob' };
* var users = [ user1, user2, user3 ];
* var isFamous = R.pathEq(['address', 'zipCode'], 90210);
* R.filter(isFamous, users); //=> [ user1 ]
*/
var pathEq = _curry3(function pathEq(_path, val, obj) {
return equals(path(_path, obj), val);
});
/**
* Returns a new list by plucking the same named property off all objects in
* the list supplied.
*
* `pluck` will work on
* any [functor](https://github.com/fantasyland/fantasy-land#functor) in
* addition to arrays, as it is equivalent to `R.map(R.prop(k), f)`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Functor f => k -> f {k: v} -> f v
* @param {Number|String} key The key name to pluck off of each object.
* @param {Array} f The array or functor to consider.
* @return {Array} The list of values for the given key.
* @see R.props
* @example
*
* R.pluck('a')([{a: 1}, {a: 2}]); //=> [1, 2]
* R.pluck(0)([[1, 2], [3, 4]]); //=> [1, 3]
* R.pluck('val', {a: {val: 3}, b: {val: 5}}); //=> {a: 3, b: 5}
* @symb R.pluck('x', [{x: 1, y: 2}, {x: 3, y: 4}, {x: 5, y: 6}]) = [1, 3, 5]
* @symb R.pluck(0, [[1, 2], [3, 4], [5, 6]]) = [1, 3, 5]
*/
var pluck = _curry2(function pluck(p, list) {
return map(prop(p), list);
});
/**
* Reasonable analog to SQL `select` statement.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @category Relation
* @sig [k] -> [{k: v}] -> [{k: v}]
* @param {Array} props The property names to project
* @param {Array} objs The objects to query
* @return {Array} An array of objects with just the `props` properties.
* @example
*
* var abby = {name: 'Abby', age: 7, hair: 'blond', grade: 2};
* var fred = {name: 'Fred', age: 12, hair: 'brown', grade: 7};
* var kids = [abby, fred];
* R.project(['name', 'grade'], kids); //=> [{name: 'Abby', grade: 2}, {name: 'Fred', grade: 7}]
*/
// passing `identity` gives correct arity
var project = useWith(_map, [
pickAll,
identity
]);
/**
* Returns `true` if the specified object property is equal, in
* [`R.equals`](#equals) terms, to the given value; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig String -> a -> Object -> Boolean
* @param {String} name
* @param {*} val
* @param {*} obj
* @return {Boolean}
* @see R.equals, R.propSatisfies
* @example
*
* var abby = {name: 'Abby', age: 7, hair: 'blond'};
* var fred = {name: 'Fred', age: 12, hair: 'brown'};
* var rusty = {name: 'Rusty', age: 10, hair: 'brown'};
* var alois = {name: 'Alois', age: 15, disposition: 'surly'};
* var kids = [abby, fred, rusty, alois];
* var hasBrownHair = R.propEq('hair', 'brown');
* R.filter(hasBrownHair, kids); //=> [fred, rusty]
*/
var propEq = _curry3(function propEq(name, val, obj) {
return equals(val, obj[name]);
});
/**
* Returns a single item by iterating through the list, successively calling
* the iterator function and passing it an accumulator value and the current
* value from the array, and then passing the result to the next call.
*
* The iterator function receives two values: *(acc, value)*. It may use
* [`R.reduced`](#reduced) to shortcut the iteration.
*
* The arguments' order of [`reduceRight`](#reduceRight)'s iterator function
* is *(value, acc)*.
*
* Note: `R.reduce` does not skip deleted or unassigned indices (sparse
* arrays), unlike the native `Array.prototype.reduce` method. For more details
* on this behavior, see:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce#Description
*
* Dispatches to the `reduce` method of the third argument, if present. When
* doing so, it is up to the user to handle the [`R.reduced`](#reduced)
* shortcuting, as this is not implemented by `reduce`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig ((a, b) -> a) -> a -> [b] -> a
* @param {Function} fn The iterator function. Receives two values, the accumulator and the
* current element from the array.
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.reduced, R.addIndex, R.reduceRight
* @example
*
* R.reduce(R.subtract, 0, [1, 2, 3, 4]) // => ((((0 - 1) - 2) - 3) - 4) = -10
* - -10
* / \ / \
* - 4 -6 4
* / \ / \
* - 3 ==> -3 3
* / \ / \
* - 2 -1 2
* / \ / \
* 0 1 0 1
*
* @symb R.reduce(f, a, [b, c, d]) = f(f(f(a, b), c), d)
*/
var reduce = _curry3(_reduce);
/**
* Groups the elements of the list according to the result of calling
* the String-returning function `keyFn` on each element and reduces the elements
* of each group to a single value via the reducer function `valueFn`.
*
* This function is basically a more general [`groupBy`](#groupBy) function.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.20.0
* @category List
* @sig ((a, b) -> a) -> a -> (b -> String) -> [b] -> {String: a}
* @param {Function} valueFn The function that reduces the elements of each group to a single
* value. Receives two values, accumulator for a particular group and the current element.
* @param {*} acc The (initial) accumulator value for each group.
* @param {Function} keyFn The function that maps the list's element into a key.
* @param {Array} list The array to group.
* @return {Object} An object with the output of `keyFn` for keys, mapped to the output of
* `valueFn` for elements which produced that key when passed to `keyFn`.
* @see R.groupBy, R.reduce
* @example
*
* var reduceToNamesBy = R.reduceBy((acc, student) => acc.concat(student.name), []);
* var namesByGrade = reduceToNamesBy(function(student) {
* var score = student.score;
* return score < 65 ? 'F' :
* score < 70 ? 'D' :
* score < 80 ? 'C' :
* score < 90 ? 'B' : 'A';
* });
* var students = [{name: 'Lucy', score: 92},
* {name: 'Drew', score: 85},
* // ...
* {name: 'Bart', score: 62}];
* namesByGrade(students);
* // {
* // 'A': ['Lucy'],
* // 'B': ['Drew']
* // // ...,
* // 'F': ['Bart']
* // }
*/
var reduceBy = _curryN(4, [], _dispatchable([], _xreduceBy, function reduceBy(valueFn, valueAcc, keyFn, list) {
return _reduce(function (acc, elt) {
var key = keyFn(elt);
acc[key] = valueFn(_has(key, acc) ? acc[key] : valueAcc, elt);
return acc;
}, {}, list);
}));
/**
* Like [`reduce`](#reduce), `reduceWhile` returns a single item by iterating
* through the list, successively calling the iterator function. `reduceWhile`
* also takes a predicate that is evaluated before each step. If the predicate
* returns `false`, it "short-circuits" the iteration and returns the current
* value of the accumulator.
*
* @func
* @memberOf R
* @since v0.22.0
* @category List
* @sig ((a, b) -> Boolean) -> ((a, b) -> a) -> a -> [b] -> a
* @param {Function} pred The predicate. It is passed the accumulator and the
* current element.
* @param {Function} fn The iterator function. Receives two values, the
* accumulator and the current element.
* @param {*} a The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.reduce, R.reduced
* @example
*
* var isOdd = (acc, x) => x % 2 === 1;
* var xs = [1, 3, 5, 60, 777, 800];
* R.reduceWhile(isOdd, R.add, 0, xs); //=> 9
*
* var ys = [2, 4, 6]
* R.reduceWhile(isOdd, R.add, 111, ys); //=> 111
*/
var reduceWhile = _curryN(4, [], function _reduceWhile(pred, fn, a, list) {
return _reduce(function (acc, x) {
return pred(acc, x) ? fn(acc, x) : _reduced(acc);
}, a, list);
});
/**
* The complement of [`filter`](#filter).
*
* Acts as a transducer if a transformer is given in list position. Filterable
* objects include plain objects or any object that has a filter method such
* as `Array`.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig Filterable f => (a -> Boolean) -> f a -> f a
* @param {Function} pred
* @param {Array} filterable
* @return {Array}
* @see R.filter, R.transduce, R.addIndex
* @example
*
* var isOdd = (n) => n % 2 === 1;
*
* R.reject(isOdd, [1, 2, 3, 4]); //=> [2, 4]
*
* R.reject(isOdd, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}
*/
var reject = _curry2(function reject(pred, filterable) {
return filter(_complement(pred), filterable);
});
/**
* Returns a fixed list of size `n` containing a specified identical value.
*
* @func
* @memberOf R
* @since v0.1.1
* @category List
* @sig a -> n -> [a]
* @param {*} value The value to repeat.
* @param {Number} n The desired size of the output list.
* @return {Array} A new array containing `n` `value`s.
* @see R.times
* @example
*
* R.repeat('hi', 5); //=> ['hi', 'hi', 'hi', 'hi', 'hi']
*
* var obj = {};
* var repeatedObjs = R.repeat(obj, 5); //=> [{}, {}, {}, {}, {}]
* repeatedObjs[0] === repeatedObjs[1]; //=> true
* @symb R.repeat(a, 0) = []
* @symb R.repeat(a, 1) = [a]
* @symb R.repeat(a, 2) = [a, a]
*/
var repeat = _curry2(function repeat(value, n) {
return times(always(value), n);
});
/**
* Checks if a list starts with the provided values
*
* @func
* @memberOf R
* @since v0.24.0
* @category List
* @sig [a] -> Boolean
* @sig String -> Boolean
* @param {*} prefix
* @param {*} list
* @return {Boolean}
* @example
*
* R.startsWith('a', 'abc') //=> true
* R.startsWith('b', 'abc') //=> false
* R.startsWith(['a'], ['a', 'b', 'c']) //=> true
* R.startsWith(['b'], ['a', 'b', 'c']) //=> false
*/
var startsWith = _curry2(function (prefix, list) {
return equals(take(prefix.length, list), prefix);
});
/**
* Adds together all the elements of a list.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig [Number] -> Number
* @param {Array} list An array of numbers
* @return {Number} The sum of all the numbers in the list.
* @see R.reduce
* @example
*
* R.sum([2,4,6,8,100,1]); //=> 121
*/
var sum = reduce(add, 0);
/**
* Returns a new list containing the last `n` elements of the given list.
* If `n > list.length`, returns a list of `list.length` elements.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig Number -> [a] -> [a]
* @sig Number -> String -> String
* @param {Number} n The number of elements to return.
* @param {Array} xs The collection to consider.
* @return {Array}
* @see R.dropLast
* @example
*
* R.takeLast(1, ['foo', 'bar', 'baz']); //=> ['baz']
* R.takeLast(2, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']
* R.takeLast(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
* R.takeLast(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
* R.takeLast(3, 'ramda'); //=> 'mda'
*/
var takeLast = _curry2(function takeLast(n, xs) {
return drop(n >= 0 ? xs.length - n : 0, xs);
});
/**
* Initializes a transducer using supplied iterator function. Returns a single
* item by iterating through the list, successively calling the transformed
* iterator function and passing it an accumulator value and the current value
* from the array, and then passing the result to the next call.
*
* The iterator function receives two values: *(acc, value)*. It will be
* wrapped as a transformer to initialize the transducer. A transformer can be
* passed directly in place of an iterator function. In both cases, iteration
* may be stopped early with the [`R.reduced`](#reduced) function.
*
* A transducer is a function that accepts a transformer and returns a
* transformer and can be composed directly.
*
* A transformer is an an object that provides a 2-arity reducing iterator
* function, step, 0-arity initial value function, init, and 1-arity result
* extraction function, result. The step function is used as the iterator
* function in reduce. The result function is used to convert the final
* accumulator into the return type and in most cases is
* [`R.identity`](#identity). The init function can be used to provide an
* initial accumulator, but is ignored by transduce.
*
* The iteration is performed with [`R.reduce`](#reduce) after initializing the transducer.
*
* @func
* @memberOf R
* @since v0.12.0
* @category List
* @sig (c -> c) -> ((a, b) -> a) -> a -> [b] -> a
* @param {Function} xf The transducer function. Receives a transformer and returns a transformer.
* @param {Function} fn The iterator function. Receives two values, the accumulator and the
* current element from the array. Wrapped as transformer, if necessary, and used to
* initialize the transducer
* @param {*} acc The initial accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.reduce, R.reduced, R.into
* @example
*
* var numbers = [1, 2, 3, 4];
* var transducer = R.compose(R.map(R.add(1)), R.take(2));
* R.transduce(transducer, R.flip(R.append), [], numbers); //=> [2, 3]
*
* var isOdd = (x) => x % 2 === 1;
* var firstOddTransducer = R.compose(R.filter(isOdd), R.take(1));
* R.transduce(firstOddTransducer, R.flip(R.append), [], R.range(0, 100)); //=> [1]
*/
var transduce = curryN(4, function transduce(xf, fn, acc, list) {
return _reduce(xf(typeof fn === 'function' ? _xwrap(fn) : fn), acc, list);
});
/**
* Combines two lists into a set (i.e. no duplicates) composed of the elements
* of each list. Duplication is determined according to the value returned by
* applying the supplied predicate to two list elements.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]
* @param {Function} pred A predicate used to test whether two items are equal.
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The first and second lists concatenated, with
* duplicates removed.
* @see R.union
* @example
*
* var l1 = [{a: 1}, {a: 2}];
* var l2 = [{a: 1}, {a: 4}];
* R.unionWith(R.eqBy(R.prop('a')), l1, l2); //=> [{a: 1}, {a: 2}, {a: 4}]
*/
var unionWith = _curry3(function unionWith(pred, list1, list2) {
return uniqWith(pred, _concat(list1, list2));
});
/**
* Takes a spec object and a test object; returns true if the test satisfies
* the spec, false otherwise. An object satisfies the spec if, for each of the
* spec's own properties, accessing that property of the object gives the same
* value (in [`R.equals`](#equals) terms) as accessing that property of the
* spec.
*
* `whereEq` is a specialization of [`where`](#where).
*
* @func
* @memberOf R
* @since v0.14.0
* @category Object
* @sig {String: *} -> {String: *} -> Boolean
* @param {Object} spec
* @param {Object} testObj
* @return {Boolean}
* @see R.where
* @example
*
* // pred :: Object -> Boolean
* var pred = R.whereEq({a: 1, b: 2});
*
* pred({a: 1}); //=> false
* pred({a: 1, b: 2}); //=> true
* pred({a: 1, b: 2, c: 3}); //=> true
* pred({a: 1, b: 1}); //=> false
*/
var whereEq = _curry2(function whereEq(spec, testObj) {
return where(map(equals, spec), testObj);
});
var _flatCat = function () {
var preservingReduced = function (xf) {
return {
'@@transducer/init': _xfBase.init,
'@@transducer/result': function (result) {
return xf['@@transducer/result'](result);
},
'@@transducer/step': function (result, input) {
var ret = xf['@@transducer/step'](result, input);
return ret['@@transducer/reduced'] ? _forceReduced(ret) : ret;
}
};
};
return function _xcat(xf) {
var rxf = preservingReduced(xf);
return {
'@@transducer/init': _xfBase.init,
'@@transducer/result': function (result) {
return rxf['@@transducer/result'](result);
},
'@@transducer/step': function (result, input) {
return !_isArrayLike(input) ? _reduce(rxf, result, [input]) : _reduce(rxf, result, input);
}
};
};
}();
// Array.prototype.indexOf doesn't exist below IE9
// manually crawl the list to distinguish between +0 and -0
// NaN
// non-zero numbers can utilise Set
// all these types can utilise Set
// null can utilise Set
// anything else not covered above, defer to R.equals
var _indexOf = function _indexOf(list, a, idx) {
var inf, item;
// Array.prototype.indexOf doesn't exist below IE9
if (typeof list.indexOf === 'function') {
switch (typeof a) {
case 'number':
if (a === 0) {
// manually crawl the list to distinguish between +0 and -0
inf = 1 / a;
while (idx < list.length) {
item = list[idx];
if (item === 0 && 1 / item === inf) {
return idx;
}
idx += 1;
}
return -1;
} else if (a !== a) {
// NaN
while (idx < list.length) {
item = list[idx];
if (typeof item === 'number' && item !== item) {
return idx;
}
idx += 1;
}
return -1;
}
// non-zero numbers can utilise Set
return list.indexOf(a, idx);
// all these types can utilise Set
case 'string':
case 'boolean':
case 'function':
case 'undefined':
return list.indexOf(a, idx);
case 'object':
if (a === null) {
// null can utilise Set
return list.indexOf(a, idx);
}
}
}
// anything else not covered above, defer to R.equals
while (idx < list.length) {
if (equals(list[idx], a)) {
return idx;
}
idx += 1;
}
return -1;
};
var _xchain = _curry2(function _xchain(f, xf) {
return map(f, _flatCat(xf));
});
/**
* Takes a list of predicates and returns a predicate that returns true for a
* given list of arguments if every one of the provided predicates is satisfied
* by those arguments.
*
* The function returned is a curried function whose arity matches that of the
* highest-arity predicate.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Logic
* @sig [(*... -> Boolean)] -> (*... -> Boolean)
* @param {Array} predicates An array of predicates to check
* @return {Function} The combined predicate
* @see R.anyPass
* @example
*
* var isQueen = R.propEq('rank', 'Q');
* var isSpade = R.propEq('suit', '♠︎');
* var isQueenOfSpades = R.allPass([isQueen, isSpade]);
*
* isQueenOfSpades({rank: 'Q', suit: '♣︎'}); //=> false
* isQueenOfSpades({rank: 'Q', suit: '♠︎'}); //=> true
*/
var allPass = _curry1(function allPass(preds) {
return curryN(reduce(max, 0, pluck('length', preds)), function () {
var idx = 0;
var len = preds.length;
while (idx < len) {
if (!preds[idx].apply(this, arguments)) {
return false;
}
idx += 1;
}
return true;
});
});
/**
* Takes a list of predicates and returns a predicate that returns true for a
* given list of arguments if at least one of the provided predicates is
* satisfied by those arguments.
*
* The function returned is a curried function whose arity matches that of the
* highest-arity predicate.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Logic
* @sig [(*... -> Boolean)] -> (*... -> Boolean)
* @param {Array} predicates An array of predicates to check
* @return {Function} The combined predicate
* @see R.allPass
* @example
*
* var isClub = R.propEq('suit', '♣');
* var isSpade = R.propEq('suit', 'â™ ');
* var isBlackCard = R.anyPass([isClub, isSpade]);
*
* isBlackCard({rank: '10', suit: '♣'}); //=> true
* isBlackCard({rank: 'Q', suit: 'â™ '}); //=> true
* isBlackCard({rank: 'Q', suit: '♦'}); //=> false
*/
var anyPass = _curry1(function anyPass(preds) {
return curryN(reduce(max, 0, pluck('length', preds)), function () {
var idx = 0;
var len = preds.length;
while (idx < len) {
if (preds[idx].apply(this, arguments)) {
return true;
}
idx += 1;
}
return false;
});
});
/**
* ap applies a list of functions to a list of values.
*
* Dispatches to the `ap` method of the second argument, if present. Also
* treats curried functions as applicatives.
*
* @func
* @memberOf R
* @since v0.3.0
* @category Function
* @sig [a -> b] -> [a] -> [b]
* @sig Apply f => f (a -> b) -> f a -> f b
* @param {*} applyF
* @param {*} applyX
* @return {*}
* @example
*
* R.ap([R.multiply(2), R.add(3)], [1,2,3]); //=> [2, 4, 6, 4, 5, 6]
* R.ap([R.concat('tasty '), R.toUpper], ['pizza', 'salad']); //=> ["tasty pizza", "tasty salad", "PIZZA", "SALAD"]
* @symb R.ap([f, g], [a, b]) = [f(a), f(b), g(a), g(b)]
*/
// else
var ap = _curry2(function ap(applyF, applyX) {
return typeof applyX['fantasy-land/ap'] === 'function' ? applyX['fantasy-land/ap'](applyF) : typeof applyF.ap === 'function' ? applyF.ap(applyX) : typeof applyF === 'function' ? function (x) {
return applyF(x)(applyX(x));
} : // else
_reduce(function (acc, f) {
return _concat(acc, map(f, applyX));
}, [], applyF);
});
/**
* Given a spec object recursively mapping properties to functions, creates a
* function producing an object of the same structure, by mapping each property
* to the result of calling its associated function with the supplied arguments.
*
* @func
* @memberOf R
* @since v0.20.0
* @category Function
* @sig {k: ((a, b, ..., m) -> v)} -> ((a, b, ..., m) -> {k: v})
* @param {Object} spec an object recursively mapping properties to functions for
* producing the values for these properties.
* @return {Function} A function that returns an object of the same structure
* as `spec', with each property set to the value returned by calling its
* associated function with the supplied arguments.
* @see R.converge, R.juxt
* @example
*
* var getMetrics = R.applySpec({
* sum: R.add,
* nested: { mul: R.multiply }
* });
* getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }
* @symb R.applySpec({ x: f, y: { z: g } })(a, b) = { x: f(a, b), y: { z: g(a, b) } }
*/
var applySpec = _curry1(function applySpec(spec) {
spec = map(function (v) {
return typeof v == 'function' ? v : applySpec(v);
}, spec);
return curryN(reduce(max, 0, pluck('length', values(spec))), function () {
var args = arguments;
return map(function (f) {
return apply(f, args);
}, spec);
});
});
/**
* Returns the result of calling its first argument with the remaining
* arguments. This is occasionally useful as a converging function for
* [`R.converge`](#converge): the first branch can produce a function while the
* remaining branches produce values to be passed to that function as its
* arguments.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Function
* @sig (*... -> a),*... -> a
* @param {Function} fn The function to apply to the remaining arguments.
* @param {...*} args Any number of positional arguments.
* @return {*}
* @see R.apply
* @example
*
* R.call(R.add, 1, 2); //=> 3
*
* var indentN = R.pipe(R.times(R.always(' ')),
* R.join(''),
* R.replace(/^(?!$)/gm));
*
* var format = R.converge(R.call, [
* R.pipe(R.prop('indent'), indentN),
* R.prop('value')
* ]);
*
* format({indent: 2, value: 'foo\nbar\nbaz\n'}); //=> ' foo\n bar\n baz\n'
* @symb R.call(f, a, b) = f(a, b)
*/
var call = curry(function call(fn) {
return fn.apply(this, Array.prototype.slice.call(arguments, 1));
});
/**
* `chain` maps a function over a list and concatenates the results. `chain`
* is also known as `flatMap` in some libraries
*
* Dispatches to the `chain` method of the second argument, if present,
* according to the [FantasyLand Chain spec](https://github.com/fantasyland/fantasy-land#chain).
*
* @func
* @memberOf R
* @since v0.3.0
* @category List
* @sig Chain m => (a -> m b) -> m a -> m b
* @param {Function} fn The function to map with
* @param {Array} list The list to map over
* @return {Array} The result of flat-mapping `list` with `fn`
* @example
*
* var duplicate = n => [n, n];
* R.chain(duplicate, [1, 2, 3]); //=> [1, 1, 2, 2, 3, 3]
*
* R.chain(R.append, R.head)([1, 2, 3]); //=> [1, 2, 3, 1]
*/
var chain = _curry2(_dispatchable([
'fantasy-land/chain',
'chain'
], _xchain, function chain(fn, monad) {
if (typeof monad === 'function') {
return function (x) {
return fn(monad(x))(x);
};
}
return _makeFlat(false)(map(fn, monad));
}));
/**
* Returns a function, `fn`, which encapsulates `if/else, if/else, ...` logic.
* `R.cond` takes a list of [predicate, transformer] pairs. All of the arguments
* to `fn` are applied to each of the predicates in turn until one returns a
* "truthy" value, at which point `fn` returns the result of applying its
* arguments to the corresponding transformer. If none of the predicates
* matches, `fn` returns undefined.
*
* @func
* @memberOf R
* @since v0.6.0
* @category Logic
* @sig [[(*... -> Boolean),(*... -> *)]] -> (*... -> *)
* @param {Array} pairs A list of [predicate, transformer]
* @return {Function}
* @example
*
* var fn = R.cond([
* [R.equals(0), R.always('water freezes at 0°C')],
* [R.equals(100), R.always('water boils at 100°C')],
* [R.T, temp => 'nothing special happens at ' + temp + '°C']
* ]);
* fn(0); //=> 'water freezes at 0°C'
* fn(50); //=> 'nothing special happens at 50°C'
* fn(100); //=> 'water boils at 100°C'
*/
var cond = _curry1(function cond(pairs) {
var arity = reduce(max, 0, map(function (pair) {
return pair[0].length;
}, pairs));
return _arity(arity, function () {
var idx = 0;
while (idx < pairs.length) {
if (pairs[idx][0].apply(this, arguments)) {
return pairs[idx][1].apply(this, arguments);
}
idx += 1;
}
});
});
/**
* Wraps a constructor function inside a curried function that can be called
* with the same arguments and returns the same type. The arity of the function
* returned is specified to allow using variadic constructor functions.
*
* @func
* @memberOf R
* @since v0.4.0
* @category Function
* @sig Number -> (* -> {*}) -> (* -> {*})
* @param {Number} n The arity of the constructor function.
* @param {Function} Fn The constructor function to wrap.
* @return {Function} A wrapped, curried constructor function.
* @example
*
* // Variadic Constructor function
* function Salad() {
* this.ingredients = arguments;
* };
* Salad.prototype.recipe = function() {
* var instructions = R.map((ingredient) => (
* 'Add a whollop of ' + ingredient, this.ingredients)
* )
* return R.join('\n', instructions)
* }
*
* var ThreeLayerSalad = R.constructN(3, Salad)
*
* // Notice we no longer need the 'new' keyword, and the constructor is curried for 3 arguments.
* var salad = ThreeLayerSalad('Mayonnaise')('Potato Chips')('Ketchup')
* console.log(salad.recipe());
* // Add a whollop of Mayonnaise
* // Add a whollop of Potato Chips
* // Add a whollop of Potato Ketchup
*/
var constructN = _curry2(function constructN(n, Fn) {
if (n > 10) {
throw new Error('Constructor with greater than ten arguments');
}
if (n === 0) {
return function () {
return new Fn();
};
}
return curry(nAry(n, function ($0, $1, $2, $3, $4, $5, $6, $7, $8, $9) {
switch (arguments.length) {
case 1:
return new Fn($0);
case 2:
return new Fn($0, $1);
case 3:
return new Fn($0, $1, $2);
case 4:
return new Fn($0, $1, $2, $3);
case 5:
return new Fn($0, $1, $2, $3, $4);
case 6:
return new Fn($0, $1, $2, $3, $4, $5);
case 7:
return new Fn($0, $1, $2, $3, $4, $5, $6);
case 8:
return new Fn($0, $1, $2, $3, $4, $5, $6, $7);
case 9:
return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8);
case 10:
return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8, $9);
}
}));
});
/**
* Accepts a converging function and a list of branching functions and returns
* a new function. When invoked, this new function is applied to some
* arguments, each branching function is applied to those same arguments. The
* results of each branching function are passed as arguments to the converging
* function to produce the return value.
*
* @func
* @memberOf R
* @since v0.4.2
* @category Function
* @sig (x1 -> x2 -> ... -> z) -> [(a -> b -> ... -> x1), (a -> b -> ... -> x2), ...] -> (a -> b -> ... -> z)
* @param {Function} after A function. `after` will be invoked with the return values of
* `fn1` and `fn2` as its arguments.
* @param {Array} functions A list of functions.
* @return {Function} A new function.
* @see R.useWith
* @example
*
* var average = R.converge(R.divide, [R.sum, R.length])
* average([1, 2, 3, 4, 5, 6, 7]) //=> 4
*
* var strangeConcat = R.converge(R.concat, [R.toUpper, R.toLower])
* strangeConcat("Yodel") //=> "YODELyodel"
*
* @symb R.converge(f, [g, h])(a, b) = f(g(a, b), h(a, b))
*/
var converge = _curry2(function converge(after, fns) {
return curryN(reduce(max, 0, pluck('length', fns)), function () {
var args = arguments;
var context = this;
return after.apply(context, _map(function (fn) {
return fn.apply(context, args);
}, fns));
});
});
/**
* Counts the elements of a list according to how many match each value of a
* key generated by the supplied function. Returns an object mapping the keys
* produced by `fn` to the number of occurrences in the list. Note that all
* keys are coerced to strings because of how JavaScript objects work.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig (a -> String) -> [a] -> {*}
* @param {Function} fn The function used to map values to keys.
* @param {Array} list The list to count elements from.
* @return {Object} An object mapping keys to number of occurrences in the list.
* @example
*
* var numbers = [1.0, 1.1, 1.2, 2.0, 3.0, 2.2];
* R.countBy(Math.floor)(numbers); //=> {'1': 3, '2': 2, '3': 1}
*
* var letters = ['a', 'b', 'A', 'a', 'B', 'c'];
* R.countBy(R.toLower)(letters); //=> {'a': 3, 'b': 2, 'c': 1}
*/
var countBy = reduceBy(function (acc, elem) {
return acc + 1;
}, 0);
/**
* Returns a new list without any consecutively repeating elements. Equality is
* determined by applying the supplied predicate to each pair of consecutive elements. The
* first element in a series of equal elements will be preserved.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.14.0
* @category List
* @sig (a, a -> Boolean) -> [a] -> [a]
* @param {Function} pred A predicate used to test whether two items are equal.
* @param {Array} list The array to consider.
* @return {Array} `list` without repeating elements.
* @see R.transduce
* @example
*
* var l = [1, -1, 1, 3, 4, -4, -4, -5, 5, 3, 3];
* R.dropRepeatsWith(R.eqBy(Math.abs), l); //=> [1, 3, 4, -5, 3]
*/
var dropRepeatsWith = _curry2(_dispatchable([], _xdropRepeatsWith, function dropRepeatsWith(pred, list) {
var result = [];
var idx = 1;
var len = list.length;
if (len !== 0) {
result[0] = list[0];
while (idx < len) {
if (!pred(last(result), list[idx])) {
result[result.length] = list[idx];
}
idx += 1;
}
}
return result;
}));
/**
* Checks if a list ends with the provided values
*
* @func
* @memberOf R
* @since v0.24.0
* @category List
* @sig [a] -> Boolean
* @sig String -> Boolean
* @param {*} suffix
* @param {*} list
* @return {Boolean}
* @example
*
* R.endsWith('c', 'abc') //=> true
* R.endsWith('b', 'abc') //=> false
* R.endsWith(['c'], ['a', 'b', 'c']) //=> true
* R.endsWith(['b'], ['a', 'b', 'c']) //=> false
*/
var endsWith = _curry2(function (suffix, list) {
return equals(takeLast(suffix.length, list), suffix);
});
/**
* Takes a function and two values in its domain and returns `true` if the
* values map to the same value in the codomain; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.18.0
* @category Relation
* @sig (a -> b) -> a -> a -> Boolean
* @param {Function} f
* @param {*} x
* @param {*} y
* @return {Boolean}
* @example
*
* R.eqBy(Math.abs, 5, -5); //=> true
*/
var eqBy = _curry3(function eqBy(f, x, y) {
return equals(f(x), f(y));
});
/**
* Reports whether two objects have the same value, in [`R.equals`](#equals)
* terms, for the specified property. Useful as a curried predicate.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig k -> {k: v} -> {k: v} -> Boolean
* @param {String} prop The name of the property to compare
* @param {Object} obj1
* @param {Object} obj2
* @return {Boolean}
*
* @example
*
* var o1 = { a: 1, b: 2, c: 3, d: 4 };
* var o2 = { a: 10, b: 20, c: 3, d: 40 };
* R.eqProps('a', o1, o2); //=> false
* R.eqProps('c', o1, o2); //=> true
*/
var eqProps = _curry3(function eqProps(prop, obj1, obj2) {
return equals(obj1[prop], obj2[prop]);
});
/**
* Splits a list into sub-lists stored in an object, based on the result of
* calling a String-returning function on each element, and grouping the
* results according to values returned.
*
* Dispatches to the `groupBy` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig (a -> String) -> [a] -> {String: [a]}
* @param {Function} fn Function :: a -> String
* @param {Array} list The array to group
* @return {Object} An object with the output of `fn` for keys, mapped to arrays of elements
* that produced that key when passed to `fn`.
* @see R.transduce
* @example
*
* var byGrade = R.groupBy(function(student) {
* var score = student.score;
* return score < 65 ? 'F' :
* score < 70 ? 'D' :
* score < 80 ? 'C' :
* score < 90 ? 'B' : 'A';
* });
* var students = [{name: 'Abby', score: 84},
* {name: 'Eddy', score: 58},
* // ...
* {name: 'Jack', score: 69}];
* byGrade(students);
* // {
* // 'A': [{name: 'Dianne', score: 99}],
* // 'B': [{name: 'Abby', score: 84}]
* // // ...,
* // 'F': [{name: 'Eddy', score: 58}]
* // }
*/
var groupBy = _curry2(_checkForMethod('groupBy', reduceBy(function (acc, item) {
if (acc == null) {
acc = [];
}
acc.push(item);
return acc;
}, null)));
/**
* Given a function that generates a key, turns a list of objects into an
* object indexing the objects by the given key. Note that if multiple
* objects generate the same value for the indexing key only the last value
* will be included in the generated object.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig (a -> String) -> [{k: v}] -> {k: {k: v}}
* @param {Function} fn Function :: a -> String
* @param {Array} array The array of objects to index
* @return {Object} An object indexing each array element by the given property.
* @example
*
* var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
* R.indexBy(R.prop('id'), list);
* //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}
*/
var indexBy = reduceBy(function (acc, elem) {
return elem;
}, null);
/**
* Returns the position of the first occurrence of an item in an array, or -1
* if the item is not included in the array. [`R.equals`](#equals) is used to
* determine equality.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig a -> [a] -> Number
* @param {*} target The item to find.
* @param {Array} xs The array to search in.
* @return {Number} the index of the target, or -1 if the target is not found.
* @see R.lastIndexOf
* @example
*
* R.indexOf(3, [1,2,3,4]); //=> 2
* R.indexOf(10, [1,2,3,4]); //=> -1
*/
var indexOf = _curry2(function indexOf(target, xs) {
return typeof xs.indexOf === 'function' && !_isArray(xs) ? xs.indexOf(target) : _indexOf(xs, target, 0);
});
/**
* juxt applies a list of functions to a list of values.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Function
* @sig [(a, b, ..., m) -> n] -> ((a, b, ..., m) -> [n])
* @param {Array} fns An array of functions
* @return {Function} A function that returns a list of values after applying each of the original `fns` to its parameters.
* @see R.applySpec
* @example
*
* var getRange = R.juxt([Math.min, Math.max]);
* getRange(3, 4, 9, -3); //=> [-3, 9]
* @symb R.juxt([f, g, h])(a, b) = [f(a, b), g(a, b), h(a, b)]
*/
var juxt = _curry1(function juxt(fns) {
return converge(function () {
return Array.prototype.slice.call(arguments, 0);
}, fns);
});
/**
* Returns a lens for the given getter and setter functions. The getter "gets"
* the value of the focus; the setter "sets" the value of the focus. The setter
* should not mutate the data structure.
*
* @func
* @memberOf R
* @since v0.8.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig (s -> a) -> ((a, s) -> s) -> Lens s a
* @param {Function} getter
* @param {Function} setter
* @return {Lens}
* @see R.view, R.set, R.over, R.lensIndex, R.lensProp
* @example
*
* var xLens = R.lens(R.prop('x'), R.assoc('x'));
*
* R.view(xLens, {x: 1, y: 2}); //=> 1
* R.set(xLens, 4, {x: 1, y: 2}); //=> {x: 4, y: 2}
* R.over(xLens, R.negate, {x: 1, y: 2}); //=> {x: -1, y: 2}
*/
var lens = _curry2(function lens(getter, setter) {
return function (toFunctorFn) {
return function (target) {
return map(function (focus) {
return setter(focus, target);
}, toFunctorFn(getter(target)));
};
};
});
/**
* Returns a lens whose focus is the specified index.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig Number -> Lens s a
* @param {Number} n
* @return {Lens}
* @see R.view, R.set, R.over
* @example
*
* var headLens = R.lensIndex(0);
*
* R.view(headLens, ['a', 'b', 'c']); //=> 'a'
* R.set(headLens, 'x', ['a', 'b', 'c']); //=> ['x', 'b', 'c']
* R.over(headLens, R.toUpper, ['a', 'b', 'c']); //=> ['A', 'b', 'c']
*/
var lensIndex = _curry1(function lensIndex(n) {
return lens(nth(n), update(n));
});
/**
* Returns a lens whose focus is the specified path.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Object
* @typedefn Idx = String | Int
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig [Idx] -> Lens s a
* @param {Array} path The path to use.
* @return {Lens}
* @see R.view, R.set, R.over
* @example
*
* var xHeadYLens = R.lensPath(['x', 0, 'y']);
*
* R.view(xHeadYLens, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
* //=> 2
* R.set(xHeadYLens, 1, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
* //=> {x: [{y: 1, z: 3}, {y: 4, z: 5}]}
* R.over(xHeadYLens, R.negate, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
* //=> {x: [{y: -2, z: 3}, {y: 4, z: 5}]}
*/
var lensPath = _curry1(function lensPath(p) {
return lens(path(p), assocPath(p));
});
/**
* Returns a lens whose focus is the specified property.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Object
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
* @sig String -> Lens s a
* @param {String} k
* @return {Lens}
* @see R.view, R.set, R.over
* @example
*
* var xLens = R.lensProp('x');
*
* R.view(xLens, {x: 1, y: 2}); //=> 1
* R.set(xLens, 4, {x: 1, y: 2}); //=> {x: 4, y: 2}
* R.over(xLens, R.negate, {x: 1, y: 2}); //=> {x: -1, y: 2}
*/
var lensProp = _curry1(function lensProp(k) {
return lens(prop(k), assoc(k));
});
/**
* "lifts" a function to be the specified arity, so that it may "map over" that
* many lists, Functions or other objects that satisfy the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).
*
* @func
* @memberOf R
* @since v0.7.0
* @category Function
* @sig Number -> (*... -> *) -> ([*]... -> [*])
* @param {Function} fn The function to lift into higher context
* @return {Function} The lifted function.
* @see R.lift, R.ap
* @example
*
* var madd3 = R.liftN(3, (...args) => R.sum(args));
* madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]
*/
var liftN = _curry2(function liftN(arity, fn) {
var lifted = curryN(arity, fn);
return curryN(arity, function () {
return _reduce(ap, map(lifted, arguments[0]), Array.prototype.slice.call(arguments, 1));
});
});
/**
* Returns the mean of the given list of numbers.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Math
* @sig [Number] -> Number
* @param {Array} list
* @return {Number}
* @see R.median
* @example
*
* R.mean([2, 7, 9]); //=> 6
* R.mean([]); //=> NaN
*/
var mean = _curry1(function mean(list) {
return sum(list) / list.length;
});
/**
* Returns the median of the given list of numbers.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Math
* @sig [Number] -> Number
* @param {Array} list
* @return {Number}
* @see R.mean
* @example
*
* R.median([2, 9, 7]); //=> 7
* R.median([7, 2, 10, 9]); //=> 8
* R.median([]); //=> NaN
*/
var median = _curry1(function median(list) {
var len = list.length;
if (len === 0) {
return NaN;
}
var width = 2 - len % 2;
var idx = (len - width) / 2;
return mean(Array.prototype.slice.call(list, 0).sort(function (a, b) {
return a < b ? -1 : a > b ? 1 : 0;
}).slice(idx, idx + width));
});
/**
* Creates a new object with the own properties of the first object merged with
* the own properties of the second object. If a key exists in both objects:
* - and both values are objects, the two values will be recursively merged
* - otherwise the value from the first object will be used.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Object
* @sig {a} -> {a} -> {a}
* @param {Object} lObj
* @param {Object} rObj
* @return {Object}
* @see R.merge, R.mergeDeepRight, R.mergeDeepWith, R.mergeDeepWithKey
* @example
*
* R.mergeDeepLeft({ name: 'fred', age: 10, contact: { email: 'moo@example.com' }},
* { age: 40, contact: { email: 'baa@example.com' }});
* //=> { name: 'fred', age: 10, contact: { email: 'moo@example.com' }}
*/
var mergeDeepLeft = _curry2(function mergeDeepLeft(lObj, rObj) {
return mergeDeepWithKey(function (k, lVal, rVal) {
return lVal;
}, lObj, rObj);
});
/**
* Creates a new object with the own properties of the first object merged with
* the own properties of the second object. If a key exists in both objects:
* - and both values are objects, the two values will be recursively merged
* - otherwise the value from the second object will be used.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Object
* @sig {a} -> {a} -> {a}
* @param {Object} lObj
* @param {Object} rObj
* @return {Object}
* @see R.merge, R.mergeDeepLeft, R.mergeDeepWith, R.mergeDeepWithKey
* @example
*
* R.mergeDeepRight({ name: 'fred', age: 10, contact: { email: 'moo@example.com' }},
* { age: 40, contact: { email: 'baa@example.com' }});
* //=> { name: 'fred', age: 40, contact: { email: 'baa@example.com' }}
*/
var mergeDeepRight = _curry2(function mergeDeepRight(lObj, rObj) {
return mergeDeepWithKey(function (k, lVal, rVal) {
return rVal;
}, lObj, rObj);
});
/**
* Creates a new object with the own properties of the two provided objects.
* If a key exists in both objects:
* - and both associated values are also objects then the values will be
* recursively merged.
* - otherwise the provided function is applied to associated values using the
* resulting value as the new value associated with the key.
* If a key only exists in one object, the value will be associated with the key
* of the resulting object.
*
* @func
* @memberOf R
* @since v0.24.0
* @category Object
* @sig (a -> a -> a) -> {a} -> {a} -> {a}
* @param {Function} fn
* @param {Object} lObj
* @param {Object} rObj
* @return {Object}
* @see R.mergeWith, R.mergeDeep, R.mergeDeepWithKey
* @example
*
* R.mergeDeepWith(R.concat,
* { a: true, c: { values: [10, 20] }},
* { b: true, c: { values: [15, 35] }});
* //=> { a: true, b: true, c: { values: [10, 20, 15, 35] }}
*/
var mergeDeepWith = _curry3(function mergeDeepWith(fn, lObj, rObj) {
return mergeDeepWithKey(function (k, lVal, rVal) {
return fn(lVal, rVal);
}, lObj, rObj);
});
/**
* Takes a predicate and a list or other `Filterable` object and returns the
* pair of filterable objects of the same type of elements which do and do not
* satisfy, the predicate, respectively. Filterable objects include plain objects or any object
* that has a filter method such as `Array`.
*
* @func
* @memberOf R
* @since v0.1.4
* @category List
* @sig Filterable f => (a -> Boolean) -> f a -> [f a, f a]
* @param {Function} pred A predicate to determine which side the element belongs to.
* @param {Array} filterable the list (or other filterable) to partition.
* @return {Array} An array, containing first the subset of elements that satisfy the
* predicate, and second the subset of elements that do not satisfy.
* @see R.filter, R.reject
* @example
*
* R.partition(R.contains('s'), ['sss', 'ttt', 'foo', 'bars']);
* // => [ [ 'sss', 'bars' ], [ 'ttt', 'foo' ] ]
*
* R.partition(R.contains('s'), { a: 'sss', b: 'ttt', foo: 'bars' });
* // => [ { a: 'sss', foo: 'bars' }, { b: 'ttt' } ]
*/
var partition = juxt([
filter,
reject
]);
/**
* Performs left-to-right function composition. The leftmost function may have
* any arity; the remaining functions must be unary.
*
* In some libraries this function is named `sequence`.
*
* **Note:** The result of pipe is not automatically curried.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (((a, b, ..., n) -> o), (o -> p), ..., (x -> y), (y -> z)) -> ((a, b, ..., n) -> z)
* @param {...Function} functions
* @return {Function}
* @see R.compose
* @example
*
* var f = R.pipe(Math.pow, R.negate, R.inc);
*
* f(3, 4); // -(3^4) + 1
* @symb R.pipe(f, g, h)(a, b) = h(g(f(a, b)))
*/
var pipe = function pipe() {
if (arguments.length === 0) {
throw new Error('pipe requires at least one argument');
}
return _arity(arguments[0].length, reduce(_pipe, arguments[0], tail(arguments)));
};
/**
* Performs left-to-right composition of one or more Promise-returning
* functions. The leftmost function may have any arity; the remaining functions
* must be unary.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Function
* @sig ((a -> Promise b), (b -> Promise c), ..., (y -> Promise z)) -> (a -> Promise z)
* @param {...Function} functions
* @return {Function}
* @see R.composeP
* @example
*
* // followersForUser :: String -> Promise [User]
* var followersForUser = R.pipeP(db.getUserById, db.getFollowers);
*/
var pipeP = function pipeP() {
if (arguments.length === 0) {
throw new Error('pipeP requires at least one argument');
}
return _arity(arguments[0].length, reduce(_pipeP, arguments[0], tail(arguments)));
};
/**
* Multiplies together all the elements of a list.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Math
* @sig [Number] -> Number
* @param {Array} list An array of numbers
* @return {Number} The product of all the numbers in the list.
* @see R.reduce
* @example
*
* R.product([2,4,6,8,100,1]); //=> 38400
*/
var product = reduce(multiply, 1);
/**
* Transforms a [Traversable](https://github.com/fantasyland/fantasy-land#traversable)
* of [Applicative](https://github.com/fantasyland/fantasy-land#applicative) into an
* Applicative of Traversable.
*
* Dispatches to the `sequence` method of the second argument, if present.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig (Applicative f, Traversable t) => (a -> f a) -> t (f a) -> f (t a)
* @param {Function} of
* @param {*} traversable
* @return {*}
* @see R.traverse
* @example
*
* R.sequence(Maybe.of, [Just(1), Just(2), Just(3)]); //=> Just([1, 2, 3])
* R.sequence(Maybe.of, [Just(1), Just(2), Nothing()]); //=> Nothing()
*
* R.sequence(R.of, Just([1, 2, 3])); //=> [Just(1), Just(2), Just(3)]
* R.sequence(R.of, Nothing()); //=> [Nothing()]
*/
var sequence = _curry2(function sequence(of, traversable) {
return typeof traversable.sequence === 'function' ? traversable.sequence(of) : reduceRight(function (x, acc) {
return ap(map(prepend, x), acc);
}, of([]), traversable);
});
/**
* Maps an [Applicative](https://github.com/fantasyland/fantasy-land#applicative)-returning
* function over a [Traversable](https://github.com/fantasyland/fantasy-land#traversable),
* then uses [`sequence`](#sequence) to transform the resulting Traversable of Applicative
* into an Applicative of Traversable.
*
* Dispatches to the `sequence` method of the third argument, if present.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig (Applicative f, Traversable t) => (a -> f a) -> (a -> f b) -> t a -> f (t b)
* @param {Function} of
* @param {Function} f
* @param {*} traversable
* @return {*}
* @see R.sequence
* @example
*
* // Returns `Nothing` if the given divisor is `0`
* safeDiv = n => d => d === 0 ? Nothing() : Just(n / d)
*
* R.traverse(Maybe.of, safeDiv(10), [2, 4, 5]); //=> Just([5, 2.5, 2])
* R.traverse(Maybe.of, safeDiv(10), [2, 0, 5]); //=> Nothing
*/
var traverse = _curry3(function traverse(of, f, traversable) {
return typeof traversable['fantasy-land/traverse'] === 'function' ? traversable['fantasy-land/traverse'](f, of) : sequence(of, map(f, traversable));
});
/**
* Shorthand for `R.chain(R.identity)`, which removes one level of nesting from
* any [Chain](https://github.com/fantasyland/fantasy-land#chain).
*
* @func
* @memberOf R
* @since v0.3.0
* @category List
* @sig Chain c => c (c a) -> c a
* @param {*} list
* @return {*}
* @see R.flatten, R.chain
* @example
*
* R.unnest([1, [2], [[3]]]); //=> [1, 2, [3]]
* R.unnest([[1, 2], [3, 4], [5, 6]]); //=> [1, 2, 3, 4, 5, 6]
*/
var unnest = chain(_identity);
var _contains = function _contains(a, list) {
return _indexOf(list, a, 0) >= 0;
};
// mapPairs :: (Object, [String]) -> [String]
var _toString = function _toString(x, seen) {
var recur = function recur(y) {
var xs = seen.concat([x]);
return _contains(y, xs) ? '<Circular>' : _toString(y, xs);
};
// mapPairs :: (Object, [String]) -> [String]
var mapPairs = function (obj, keys) {
return _map(function (k) {
return _quote(k) + ': ' + recur(obj[k]);
}, keys.slice().sort());
};
switch (Object.prototype.toString.call(x)) {
case '[object Arguments]':
return '(function() { return arguments; }(' + _map(recur, x).join(', ') + '))';
case '[object Array]':
return '[' + _map(recur, x).concat(mapPairs(x, reject(function (k) {
return /^\d+$/.test(k);
}, keys(x)))).join(', ') + ']';
case '[object Boolean]':
return typeof x === 'object' ? 'new Boolean(' + recur(x.valueOf()) + ')' : x.toString();
case '[object Date]':
return 'new Date(' + (isNaN(x.valueOf()) ? recur(NaN) : _quote(_toISOString(x))) + ')';
case '[object Null]':
return 'null';
case '[object Number]':
return typeof x === 'object' ? 'new Number(' + recur(x.valueOf()) + ')' : 1 / x === -Infinity ? '-0' : x.toString(10);
case '[object String]':
return typeof x === 'object' ? 'new String(' + recur(x.valueOf()) + ')' : _quote(x);
case '[object Undefined]':
return 'undefined';
default:
if (typeof x.toString === 'function') {
var repr = x.toString();
if (repr !== '[object Object]') {
return repr;
}
}
return '{' + mapPairs(x, keys(x)).join(', ') + '}';
}
};
/**
* Performs right-to-left function composition. The rightmost function may have
* any arity; the remaining functions must be unary.
*
* **Note:** The result of compose is not automatically curried.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig ((y -> z), (x -> y), ..., (o -> p), ((a, b, ..., n) -> o)) -> ((a, b, ..., n) -> z)
* @param {...Function} ...functions The functions to compose
* @return {Function}
* @see R.pipe
* @example
*
* var classyGreeting = (firstName, lastName) => "The name's " + lastName + ", " + firstName + " " + lastName
* var yellGreeting = R.compose(R.toUpper, classyGreeting);
* yellGreeting('James', 'Bond'); //=> "THE NAME'S BOND, JAMES BOND"
*
* R.compose(Math.abs, R.add(1), R.multiply(2))(-4) //=> 7
*
* @symb R.compose(f, g, h)(a, b) = f(g(h(a, b)))
*/
var compose = function compose() {
if (arguments.length === 0) {
throw new Error('compose requires at least one argument');
}
return pipe.apply(this, reverse(arguments));
};
/**
* Returns the right-to-left Kleisli composition of the provided functions,
* each of which must return a value of a type supported by [`chain`](#chain).
*
* `R.composeK(h, g, f)` is equivalent to `R.compose(R.chain(h), R.chain(g), R.chain(f))`.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Function
* @sig Chain m => ((y -> m z), (x -> m y), ..., (a -> m b)) -> (a -> m z)
* @param {...Function} ...functions The functions to compose
* @return {Function}
* @see R.pipeK
* @example
*
* // get :: String -> Object -> Maybe *
* var get = R.curry((propName, obj) => Maybe(obj[propName]))
*
* // getStateCode :: Maybe String -> Maybe String
* var getStateCode = R.composeK(
* R.compose(Maybe.of, R.toUpper),
* get('state'),
* get('address'),
* get('user'),
* );
* getStateCode({"user":{"address":{"state":"ny"}}}); //=> Maybe.Just("NY")
* getStateCode({}); //=> Maybe.Nothing()
* @symb R.composeK(f, g, h)(a) = R.chain(f, R.chain(g, h(a)))
*/
var composeK = function composeK() {
if (arguments.length === 0) {
throw new Error('composeK requires at least one argument');
}
var init = Array.prototype.slice.call(arguments);
var last = init.pop();
return compose(compose.apply(this, map(chain, init)), last);
};
/**
* Performs right-to-left composition of one or more Promise-returning
* functions. The rightmost function may have any arity; the remaining
* functions must be unary.
*
* @func
* @memberOf R
* @since v0.10.0
* @category Function
* @sig ((y -> Promise z), (x -> Promise y), ..., (a -> Promise b)) -> (a -> Promise z)
* @param {...Function} functions The functions to compose
* @return {Function}
* @see R.pipeP
* @example
*
* var db = {
* users: {
* JOE: {
* name: 'Joe',
* followers: ['STEVE', 'SUZY']
* }
* }
* }
*
* // We'll pretend to do a db lookup which returns a promise
* var lookupUser = (userId) => Promise.resolve(db.users[userId])
* var lookupFollowers = (user) => Promise.resolve(user.followers)
* lookupUser('JOE').then(lookupFollowers)
*
* // followersForUser :: String -> Promise [UserId]
* var followersForUser = R.composeP(lookupFollowers, lookupUser);
* followersForUser('JOE').then(followers => console.log('Followers:', followers))
* // Followers: ["STEVE","SUZY"]
*/
var composeP = function composeP() {
if (arguments.length === 0) {
throw new Error('composeP requires at least one argument');
}
return pipeP.apply(this, reverse(arguments));
};
/**
* Wraps a constructor function inside a curried function that can be called
* with the same arguments and returns the same type.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (* -> {*}) -> (* -> {*})
* @param {Function} fn The constructor function to wrap.
* @return {Function} A wrapped, curried constructor function.
* @see R.invoker
* @example
*
* // Constructor function
* function Animal(kind) {
* this.kind = kind;
* };
* Animal.prototype.sighting = function() {
* return "It's a " + this.kind + "!";
* }
*
* var AnimalConstructor = R.construct(Animal)
*
* // Notice we no longer need the 'new' keyword:
* AnimalConstructor('Pig'); //=> {"kind": "Pig", "sighting": function (){...}};
*
* var animalTypes = ["Lion", "Tiger", "Bear"];
* var animalSighting = R.invoker(0, 'sighting');
* var sightNewAnimal = R.compose(animalSighting, AnimalConstructor);
* R.map(sightNewAnimal, animalTypes); //=> ["It's a Lion!", "It's a Tiger!", "It's a Bear!"]
*/
var construct = _curry1(function construct(Fn) {
return constructN(Fn.length, Fn);
});
/**
* Returns `true` if the specified value is equal, in [`R.equals`](#equals)
* terms, to at least one element of the given list; `false` otherwise.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig a -> [a] -> Boolean
* @param {Object} a The item to compare against.
* @param {Array} list The array to consider.
* @return {Boolean} `true` if an equivalent item is in the list, `false` otherwise.
* @see R.any
* @example
*
* R.contains(3, [1, 2, 3]); //=> true
* R.contains(4, [1, 2, 3]); //=> false
* R.contains({ name: 'Fred' }, [{ name: 'Fred' }]); //=> true
* R.contains([42], [[42]]); //=> true
*/
var contains = _curry2(_contains);
/**
* Finds the set (i.e. no duplicates) of all elements in the first list not
* contained in the second list. Objects and Arrays are compared in terms of
* value equality, not reference equality.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig [*] -> [*] -> [*]
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The elements in `list1` that are not in `list2`.
* @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith, R.without
* @example
*
* R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]
* R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]
* R.difference([{a: 1}, {b: 2}], [{a: 1}, {c: 3}]) //=> [{b: 2}]
*/
var difference = _curry2(function difference(first, second) {
var out = [];
var idx = 0;
var firstLen = first.length;
while (idx < firstLen) {
if (!_contains(first[idx], second) && !_contains(first[idx], out)) {
out[out.length] = first[idx];
}
idx += 1;
}
return out;
});
/**
* Returns a new list without any consecutively repeating elements.
* [`R.equals`](#equals) is used to determine equality.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.14.0
* @category List
* @sig [a] -> [a]
* @param {Array} list The array to consider.
* @return {Array} `list` without repeating elements.
* @see R.transduce
* @example
*
* R.dropRepeats([1, 1, 1, 2, 3, 4, 4, 2, 2]); //=> [1, 2, 3, 4, 2]
*/
var dropRepeats = _curry1(_dispatchable([], _xdropRepeatsWith(equals), dropRepeatsWith(equals)));
/**
* "lifts" a function of arity > 1 so that it may "map over" a list, Function or other
* object that satisfies the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).
*
* @func
* @memberOf R
* @since v0.7.0
* @category Function
* @sig (*... -> *) -> ([*]... -> [*])
* @param {Function} fn The function to lift into higher context
* @return {Function} The lifted function.
* @see R.liftN
* @example
*
* var madd3 = R.lift((a, b, c) => a + b + c);
*
* madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]
*
* var madd5 = R.lift((a, b, c, d, e) => a + b + c + d + e);
*
* madd5([1,2], [3], [4, 5], [6], [7, 8]); //=> [21, 22, 22, 23, 22, 23, 23, 24]
*/
var lift = _curry1(function lift(fn) {
return liftN(fn.length, fn);
});
/**
* Returns a partial copy of an object omitting the keys specified.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Object
* @sig [String] -> {String: *} -> {String: *}
* @param {Array} names an array of String property names to omit from the new object
* @param {Object} obj The object to copy from
* @return {Object} A new object with properties from `names` not on it.
* @see R.pick
* @example
*
* R.omit(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, c: 3}
*/
var omit = _curry2(function omit(names, obj) {
var result = {};
for (var prop in obj) {
if (!_contains(prop, names)) {
result[prop] = obj[prop];
}
}
return result;
});
/**
* Returns the left-to-right Kleisli composition of the provided functions,
* each of which must return a value of a type supported by [`chain`](#chain).
*
* `R.pipeK(f, g, h)` is equivalent to `R.pipe(R.chain(f), R.chain(g), R.chain(h))`.
*
* @func
* @memberOf R
* @since v0.16.0
* @category Function
* @sig Chain m => ((a -> m b), (b -> m c), ..., (y -> m z)) -> (a -> m z)
* @param {...Function}
* @return {Function}
* @see R.composeK
* @example
*
* // parseJson :: String -> Maybe *
* // get :: String -> Object -> Maybe *
*
* // getStateCode :: Maybe String -> Maybe String
* var getStateCode = R.pipeK(
* parseJson,
* get('user'),
* get('address'),
* get('state'),
* R.compose(Maybe.of, R.toUpper)
* );
*
* getStateCode('{"user":{"address":{"state":"ny"}}}');
* //=> Just('NY')
* getStateCode('[Invalid JSON]');
* //=> Nothing()
* @symb R.pipeK(f, g, h)(a) = R.chain(h, R.chain(g, f(a)))
*/
var pipeK = function pipeK() {
if (arguments.length === 0) {
throw new Error('pipeK requires at least one argument');
}
return composeK.apply(this, reverse(arguments));
};
/**
* Returns the string representation of the given value. `eval`'ing the output
* should result in a value equivalent to the input value. Many of the built-in
* `toString` methods do not satisfy this requirement.
*
* If the given value is an `[object Object]` with a `toString` method other
* than `Object.prototype.toString`, this method is invoked with no arguments
* to produce the return value. This means user-defined constructor functions
* can provide a suitable `toString` method. For example:
*
* function Point(x, y) {
* this.x = x;
* this.y = y;
* }
*
* Point.prototype.toString = function() {
* return 'new Point(' + this.x + ', ' + this.y + ')';
* };
*
* R.toString(new Point(1, 2)); //=> 'new Point(1, 2)'
*
* @func
* @memberOf R
* @since v0.14.0
* @category String
* @sig * -> String
* @param {*} val
* @return {String}
* @example
*
* R.toString(42); //=> '42'
* R.toString('abc'); //=> '"abc"'
* R.toString([1, 2, 3]); //=> '[1, 2, 3]'
* R.toString({foo: 1, bar: 2, baz: 3}); //=> '{"bar": 2, "baz": 3, "foo": 1}'
* R.toString(new Date('2001-02-03T04:05:06Z')); //=> 'new Date("2001-02-03T04:05:06.000Z")'
*/
var toString = _curry1(function toString(val) {
return _toString(val, []);
});
/**
* Returns a new list without values in the first argument.
* [`R.equals`](#equals) is used to determine equality.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.19.0
* @category List
* @sig [a] -> [a] -> [a]
* @param {Array} list1 The values to be removed from `list2`.
* @param {Array} list2 The array to remove values from.
* @return {Array} The new array without values in `list1`.
* @see R.transduce, R.difference
* @example
*
* R.without([1, 2], [1, 2, 1, 3, 4]); //=> [3, 4]
*/
var without = _curry2(function (xs, list) {
return reject(flip(_contains)(xs), list);
});
// A simple Set type that honours R.equals semantics
/* globals Set */
// until we figure out why jsdoc chokes on this
// @param item The item to add to the Set
// @returns {boolean} true if the item did not exist prior, otherwise false
//
//
// @param item The item to check for existence in the Set
// @returns {boolean} true if the item exists in the Set, otherwise false
//
//
// Combines the logic for checking whether an item is a member of the set and
// for adding a new item to the set.
//
// @param item The item to check or add to the Set instance.
// @param shouldAdd If true, the item will be added to the set if it doesn't
// already exist.
// @param set The set instance to check or add to.
// @return {boolean} true if the item already existed, otherwise false.
//
// distinguish between +0 and -0
// these types can all utilise the native Set
// set._items['boolean'] holds a two element array
// representing [ falseExists, trueExists ]
// compare functions for reference equality
/* falls through */
// reduce the search size of heterogeneous sets by creating buckets
// for each type.
// scan through all previously applied items
var _Set = function () {
function _Set() {
/* globals Set */
this._nativeSet = typeof Set === 'function' ? new Set() : null;
this._items = {};
}
// until we figure out why jsdoc chokes on this
// @param item The item to add to the Set
// @returns {boolean} true if the item did not exist prior, otherwise false
//
_Set.prototype.add = function (item) {
return !hasOrAdd(item, true, this);
};
//
// @param item The item to check for existence in the Set
// @returns {boolean} true if the item exists in the Set, otherwise false
//
_Set.prototype.has = function (item) {
return hasOrAdd(item, false, this);
};
//
// Combines the logic for checking whether an item is a member of the set and
// for adding a new item to the set.
//
// @param item The item to check or add to the Set instance.
// @param shouldAdd If true, the item will be added to the set if it doesn't
// already exist.
// @param set The set instance to check or add to.
// @return {boolean} true if the item already existed, otherwise false.
//
function hasOrAdd(item, shouldAdd, set) {
var type = typeof item;
var prevSize, newSize;
switch (type) {
case 'string':
case 'number':
// distinguish between +0 and -0
if (item === 0 && 1 / item === -Infinity) {
if (set._items['-0']) {
return true;
} else {
if (shouldAdd) {
set._items['-0'] = true;
}
return false;
}
}
// these types can all utilise the native Set
if (set._nativeSet !== null) {
if (shouldAdd) {
prevSize = set._nativeSet.size;
set._nativeSet.add(item);
newSize = set._nativeSet.size;
return newSize === prevSize;
} else {
return set._nativeSet.has(item);
}
} else {
if (!(type in set._items)) {
if (shouldAdd) {
set._items[type] = {};
set._items[type][item] = true;
}
return false;
} else if (item in set._items[type]) {
return true;
} else {
if (shouldAdd) {
set._items[type][item] = true;
}
return false;
}
}
case 'boolean':
// set._items['boolean'] holds a two element array
// representing [ falseExists, trueExists ]
if (type in set._items) {
var bIdx = item ? 1 : 0;
if (set._items[type][bIdx]) {
return true;
} else {
if (shouldAdd) {
set._items[type][bIdx] = true;
}
return false;
}
} else {
if (shouldAdd) {
set._items[type] = item ? [
false,
true
] : [
true,
false
];
}
return false;
}
case 'function':
// compare functions for reference equality
if (set._nativeSet !== null) {
if (shouldAdd) {
prevSize = set._nativeSet.size;
set._nativeSet.add(item);
newSize = set._nativeSet.size;
return newSize === prevSize;
} else {
return set._nativeSet.has(item);
}
} else {
if (!(type in set._items)) {
if (shouldAdd) {
set._items[type] = [item];
}
return false;
}
if (!_contains(item, set._items[type])) {
if (shouldAdd) {
set._items[type].push(item);
}
return false;
}
return true;
}
case 'undefined':
if (set._items[type]) {
return true;
} else {
if (shouldAdd) {
set._items[type] = true;
}
return false;
}
case 'object':
if (item === null) {
if (!set._items['null']) {
if (shouldAdd) {
set._items['null'] = true;
}
return false;
}
return true;
}
/* falls through */
default:
// reduce the search size of heterogeneous sets by creating buckets
// for each type.
type = Object.prototype.toString.call(item);
if (!(type in set._items)) {
if (shouldAdd) {
set._items[type] = [item];
}
return false;
}
// scan through all previously applied items
if (!_contains(item, set._items[type])) {
if (shouldAdd) {
set._items[type].push(item);
}
return false;
}
return true;
}
}
return _Set;
}();
/**
* A function which calls the two provided functions and returns the `&&`
* of the results.
* It returns the result of the first function if it is false-y and the result
* of the second function otherwise. Note that this is short-circuited,
* meaning that the second function will not be invoked if the first returns a
* false-y value.
*
* In addition to functions, `R.both` also accepts any fantasy-land compatible
* applicative functor.
*
* @func
* @memberOf R
* @since v0.12.0
* @category Logic
* @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
* @param {Function} f A predicate
* @param {Function} g Another predicate
* @return {Function} a function that applies its arguments to `f` and `g` and `&&`s their outputs together.
* @see R.and
* @example
*
* var gt10 = R.gt(R.__, 10)
* var lt20 = R.lt(R.__, 20)
* var f = R.both(gt10, lt20);
* f(15); //=> true
* f(30); //=> false
*/
var both = _curry2(function both(f, g) {
return _isFunction(f) ? function _both() {
return f.apply(this, arguments) && g.apply(this, arguments);
} : lift(and)(f, g);
});
/**
* Takes a function `f` and returns a function `g` such that if called with the same arguments
* when `f` returns a "truthy" value, `g` returns `false` and when `f` returns a "falsy" value `g` returns `true`.
*
* `R.complement` may be applied to any functor
*
* @func
* @memberOf R
* @since v0.12.0
* @category Logic
* @sig (*... -> *) -> (*... -> Boolean)
* @param {Function} f
* @return {Function}
* @see R.not
* @example
*
* var isNotNil = R.complement(R.isNil);
* isNil(null); //=> true
* isNotNil(null); //=> false
* isNil(7); //=> false
* isNotNil(7); //=> true
*/
var complement = lift(not);
/**
* Returns the result of concatenating the given lists or strings.
*
* Note: `R.concat` expects both arguments to be of the same type,
* unlike the native `Array.prototype.concat` method. It will throw
* an error if you `concat` an Array with a non-Array value.
*
* Dispatches to the `concat` method of the first argument, if present.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [a] -> [a]
* @sig String -> String -> String
* @param {Array|String} firstList The first list
* @param {Array|String} secondList The second list
* @return {Array|String} A list consisting of the elements of `firstList` followed by the elements of
* `secondList`.
*
* @example
*
* R.concat('ABC', 'DEF'); // 'ABCDEF'
* R.concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
* R.concat([], []); //=> []
*/
var concat = _curry2(function concat(a, b) {
if (_isArray(a)) {
if (_isArray(b)) {
return a.concat(b);
}
throw new TypeError(toString(b) + ' is not an array');
}
if (_isString(a)) {
if (_isString(b)) {
return a + b;
}
throw new TypeError(toString(b) + ' is not a string');
}
if (a != null && _isFunction(a['fantasy-land/concat'])) {
return a['fantasy-land/concat'](b);
}
if (a != null && _isFunction(a.concat)) {
return a.concat(b);
}
throw new TypeError(toString(a) + ' does not have a method named "concat" or "fantasy-land/concat"');
});
/**
* A function wrapping calls to the two functions in an `||` operation,
* returning the result of the first function if it is truth-y and the result
* of the second function otherwise. Note that this is short-circuited,
* meaning that the second function will not be invoked if the first returns a
* truth-y value.
*
* In addition to functions, `R.either` also accepts any fantasy-land compatible
* applicative functor.
*
* @func
* @memberOf R
* @since v0.12.0
* @category Logic
* @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
* @param {Function} f a predicate
* @param {Function} g another predicate
* @return {Function} a function that applies its arguments to `f` and `g` and `||`s their outputs together.
* @see R.or
* @example
*
* var gt10 = x => x > 10;
* var even = x => x % 2 === 0;
* var f = R.either(gt10, even);
* f(101); //=> true
* f(8); //=> true
*/
var either = _curry2(function either(f, g) {
return _isFunction(f) ? function _either() {
return f.apply(this, arguments) || g.apply(this, arguments);
} : lift(or)(f, g);
});
/**
* Turns a named method with a specified arity into a function that can be
* called directly supplied with arguments and a target object.
*
* The returned function is curried and accepts `arity + 1` parameters where
* the final parameter is the target object.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig Number -> String -> (a -> b -> ... -> n -> Object -> *)
* @param {Number} arity Number of arguments the returned function should take
* before the target object.
* @param {String} method Name of the method to call.
* @return {Function} A new curried function.
* @see R.construct
* @example
*
* var sliceFrom = R.invoker(1, 'slice');
* sliceFrom(6, 'abcdefghijklm'); //=> 'ghijklm'
* var sliceFrom6 = R.invoker(2, 'slice')(6);
* sliceFrom6(8, 'abcdefghijklm'); //=> 'gh'
* @symb R.invoker(0, 'method')(o) = o['method']()
* @symb R.invoker(1, 'method')(a, o) = o['method'](a)
* @symb R.invoker(2, 'method')(a, b, o) = o['method'](a, b)
*/
var invoker = _curry2(function invoker(arity, method) {
return curryN(arity + 1, function () {
var target = arguments[arity];
if (target != null && _isFunction(target[method])) {
return target[method].apply(target, Array.prototype.slice.call(arguments, 0, arity));
}
throw new TypeError(toString(target) + ' does not have a method named "' + method + '"');
});
});
/**
* Returns a string made by inserting the `separator` between each element and
* concatenating all the elements into a single string.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig String -> [a] -> String
* @param {Number|String} separator The string used to separate the elements.
* @param {Array} xs The elements to join into a string.
* @return {String} str The string made by concatenating `xs` with `separator`.
* @see R.split
* @example
*
* var spacer = R.join(' ');
* spacer(['a', 2, 3.4]); //=> 'a 2 3.4'
* R.join('|', [1, 2, 3]); //=> '1|2|3'
*/
var join = invoker(1, 'join');
/**
* Creates a new function that, when invoked, caches the result of calling `fn`
* for a given argument set and returns the result. Subsequent calls to the
* memoized `fn` with the same argument set will not result in an additional
* call to `fn`; instead, the cached result for that set of arguments will be
* returned.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (*... -> a) -> (*... -> a)
* @param {Function} fn The function to memoize.
* @return {Function} Memoized version of `fn`.
* @see R.memoizeWith
* @example
*
* let count = 0;
* const factorial = R.memoize(n => {
* count += 1;
* return R.product(R.range(1, n + 1));
* });
* factorial(5); //=> 120
* factorial(5); //=> 120
* factorial(5); //=> 120
* count; //=> 1
*/
var memoize = memoizeWith(function () {
return toString(arguments);
});
/**
* Splits a string into an array of strings based on the given
* separator.
*
* @func
* @memberOf R
* @since v0.1.0
* @category String
* @sig (String | RegExp) -> String -> [String]
* @param {String|RegExp} sep The pattern.
* @param {String} str The string to separate into an array.
* @return {Array} The array of strings from `str` separated by `str`.
* @see R.join
* @example
*
* var pathComponents = R.split('/');
* R.tail(pathComponents('/usr/local/bin/node')); //=> ['usr', 'local', 'bin', 'node']
*
* R.split('.', 'a.b.c.xyz.d'); //=> ['a', 'b', 'c', 'xyz', 'd']
*/
var split = invoker(1, 'split');
/**
* Finds the set (i.e. no duplicates) of all elements contained in the first or
* second list, but not both.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Relation
* @sig [*] -> [*] -> [*]
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The elements in `list1` or `list2`, but not both.
* @see R.symmetricDifferenceWith, R.difference, R.differenceWith
* @example
*
* R.symmetricDifference([1,2,3,4], [7,6,5,4,3]); //=> [1,2,7,6,5]
* R.symmetricDifference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5,1,2]
*/
var symmetricDifference = _curry2(function symmetricDifference(list1, list2) {
return concat(difference(list1, list2), difference(list2, list1));
});
/**
* Finds the set (i.e. no duplicates) of all elements contained in the first or
* second list, but not both. Duplication is determined according to the value
* returned by applying the supplied predicate to two list elements.
*
* @func
* @memberOf R
* @since v0.19.0
* @category Relation
* @sig ((a, a) -> Boolean) -> [a] -> [a] -> [a]
* @param {Function} pred A predicate used to test whether two items are equal.
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The elements in `list1` or `list2`, but not both.
* @see R.symmetricDifference, R.difference, R.differenceWith
* @example
*
* var eqA = R.eqBy(R.prop('a'));
* var l1 = [{a: 1}, {a: 2}, {a: 3}, {a: 4}];
* var l2 = [{a: 3}, {a: 4}, {a: 5}, {a: 6}];
* R.symmetricDifferenceWith(eqA, l1, l2); //=> [{a: 1}, {a: 2}, {a: 5}, {a: 6}]
*/
var symmetricDifferenceWith = _curry3(function symmetricDifferenceWith(pred, list1, list2) {
return concat(differenceWith(pred, list1, list2), differenceWith(pred, list2, list1));
});
/**
* Determines whether a given string matches a given regular expression.
*
* @func
* @memberOf R
* @since v0.12.0
* @category String
* @sig RegExp -> String -> Boolean
* @param {RegExp} pattern
* @param {String} str
* @return {Boolean}
* @see R.match
* @example
*
* R.test(/^x/, 'xyz'); //=> true
* R.test(/^y/, 'xyz'); //=> false
*/
var test = _curry2(function test(pattern, str) {
if (!_isRegExp(pattern)) {
throw new TypeError('\u2018test\u2019 requires a value of type RegExp as its first argument; received ' + toString(pattern));
}
return _cloneRegExp(pattern).test(str);
});
/**
* The lower case version of a string.
*
* @func
* @memberOf R
* @since v0.9.0
* @category String
* @sig String -> String
* @param {String} str The string to lower case.
* @return {String} The lower case version of `str`.
* @see R.toUpper
* @example
*
* R.toLower('XYZ'); //=> 'xyz'
*/
var toLower = invoker(0, 'toLowerCase');
/**
* The upper case version of a string.
*
* @func
* @memberOf R
* @since v0.9.0
* @category String
* @sig String -> String
* @param {String} str The string to upper case.
* @return {String} The upper case version of `str`.
* @see R.toLower
* @example
*
* R.toUpper('abc'); //=> 'ABC'
*/
var toUpper = invoker(0, 'toUpperCase');
/**
* Returns a new list containing only one copy of each element in the original
* list, based upon the value returned by applying the supplied function to
* each list element. Prefers the first item if the supplied function produces
* the same value on two items. [`R.equals`](#equals) is used for comparison.
*
* @func
* @memberOf R
* @since v0.16.0
* @category List
* @sig (a -> b) -> [a] -> [a]
* @param {Function} fn A function used to produce a value to use during comparisons.
* @param {Array} list The array to consider.
* @return {Array} The list of unique items.
* @example
*
* R.uniqBy(Math.abs, [-1, -5, 2, 10, 1, 2]); //=> [-1, -5, 2, 10]
*/
var uniqBy = _curry2(function uniqBy(fn, list) {
var set = new _Set();
var result = [];
var idx = 0;
var appliedItem, item;
while (idx < list.length) {
item = list[idx];
appliedItem = fn(item);
if (set.add(appliedItem)) {
result.push(item);
}
idx += 1;
}
return result;
});
/**
* Returns a new list containing only one copy of each element in the original
* list. [`R.equals`](#equals) is used to determine equality.
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig [a] -> [a]
* @param {Array} list The array to consider.
* @return {Array} The list of unique items.
* @example
*
* R.uniq([1, 1, 2, 1]); //=> [1, 2]
* R.uniq([1, '1']); //=> [1, '1']
* R.uniq([[42], [42]]); //=> [[42]]
*/
var uniq = uniqBy(identity);
/**
* Combines two lists into a set (i.e. no duplicates) composed of those
* elements common to both lists.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig [*] -> [*] -> [*]
* @param {Array} list1 The first list.
* @param {Array} list2 The second list.
* @return {Array} The list of elements found in both `list1` and `list2`.
* @see R.innerJoin
* @example
*
* R.intersection([1,2,3,4], [7,6,5,4,3]); //=> [4, 3]
*/
var intersection = _curry2(function intersection(list1, list2) {
var lookupList, filteredList;
if (list1.length > list2.length) {
lookupList = list1;
filteredList = list2;
} else {
lookupList = list2;
filteredList = list1;
}
return uniq(_filter(flip(_contains)(lookupList), filteredList));
});
/**
* Combines two lists into a set (i.e. no duplicates) composed of the elements
* of each list.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Relation
* @sig [*] -> [*] -> [*]
* @param {Array} as The first list.
* @param {Array} bs The second list.
* @return {Array} The first and second lists concatenated, with
* duplicates removed.
* @example
*
* R.union([1, 2, 3], [2, 3, 4]); //=> [1, 2, 3, 4]
*/
var union = _curry2(compose(uniq, _concat));
var R = {
F: F,
T: T,
__: __,
add: add,
addIndex: addIndex,
adjust: adjust,
all: all,
allPass: allPass,
always: always,
and: and,
any: any,
anyPass: anyPass,
ap: ap,
aperture: aperture,
append: append,
apply: apply,
applySpec: applySpec,
ascend: ascend,
assoc: assoc,
assocPath: assocPath,
binary: binary,
bind: bind,
both: both,
call: call,
chain: chain,
clamp: clamp,
clone: clone,
comparator: comparator,
complement: complement,
compose: compose,
composeK: composeK,
composeP: composeP,
concat: concat,
cond: cond,
construct: construct,
constructN: constructN,
contains: contains,
converge: converge,
countBy: countBy,
curry: curry,
curryN: curryN,
dec: dec,
defaultTo: defaultTo,
descend: descend,
difference: difference,
differenceWith: differenceWith,
dissoc: dissoc,
dissocPath: dissocPath,
divide: divide,
drop: drop,
dropLast: dropLast,
dropLastWhile: dropLastWhile,
dropRepeats: dropRepeats,
dropRepeatsWith: dropRepeatsWith,
dropWhile: dropWhile,
either: either,
empty: empty,
endsWith: endsWith,
eqBy: eqBy,
eqProps: eqProps,
equals: equals,
evolve: evolve,
filter: filter,
find: find,
findIndex: findIndex,
findLast: findLast,
findLastIndex: findLastIndex,
flatten: flatten,
flip: flip,
forEach: forEach,
forEachObjIndexed: forEachObjIndexed,
fromPairs: fromPairs,
groupBy: groupBy,
groupWith: groupWith,
gt: gt,
gte: gte,
has: has,
hasIn: hasIn,
head: head,
identical: identical,
identity: identity,
ifElse: ifElse,
inc: inc,
indexBy: indexBy,
indexOf: indexOf,
init: init,
innerJoin: innerJoin,
insert: insert,
insertAll: insertAll,
intersection: intersection,
intersectionWith: intersectionWith,
intersperse: intersperse,
into: into,
invert: invert,
invertObj: invertObj,
invoker: invoker,
is: is,
isEmpty: isEmpty,
isNil: isNil,
join: join,
juxt: juxt,
keys: keys,
keysIn: keysIn,
last: last,
lastIndexOf: lastIndexOf,
length: length,
lens: lens,
lensIndex: lensIndex,
lensPath: lensPath,
lensProp: lensProp,
lift: lift,
liftN: liftN,
lt: lt,
lte: lte,
map: map,
mapAccum: mapAccum,
mapAccumRight: mapAccumRight,
mapObjIndexed: mapObjIndexed,
match: match,
mathMod: mathMod,
max: max,
maxBy: maxBy,
mean: mean,
median: median,
memoize: memoize,
memoizeWith: memoizeWith,
merge: merge,
mergeAll: mergeAll,
mergeDeepLeft: mergeDeepLeft,
mergeDeepRight: mergeDeepRight,
mergeDeepWith: mergeDeepWith,
mergeDeepWithKey: mergeDeepWithKey,
mergeWith: mergeWith,
mergeWithKey: mergeWithKey,
min: min,
minBy: minBy,
modulo: modulo,
multiply: multiply,
nAry: nAry,
negate: negate,
none: none,
not: not,
nth: nth,
nthArg: nthArg,
o: o,
objOf: objOf,
of: of,
omit: omit,
once: once,
or: or,
over: over,
pair: pair,
partial: partial,
partialRight: partialRight,
partition: partition,
path: path,
pathEq: pathEq,
pathOr: pathOr,
pathSatisfies: pathSatisfies,
pick: pick,
pickAll: pickAll,
pickBy: pickBy,
pipe: pipe,
pipeK: pipeK,
pipeP: pipeP,
pluck: pluck,
prepend: prepend,
product: product,
project: project,
prop: prop,
propEq: propEq,
propIs: propIs,
propOr: propOr,
propSatisfies: propSatisfies,
props: props,
range: range,
reduce: reduce,
reduceBy: reduceBy,
reduceRight: reduceRight,
reduceWhile: reduceWhile,
reduced: reduced,
reject: reject,
remove: remove,
repeat: repeat,
replace: replace,
reverse: reverse,
scan: scan,
sequence: sequence,
set: set,
slice: slice,
sort: sort,
sortBy: sortBy,
sortWith: sortWith,
split: split,
splitAt: splitAt,
splitEvery: splitEvery,
splitWhen: splitWhen,
startsWith: startsWith,
subtract: subtract,
sum: sum,
symmetricDifference: symmetricDifference,
symmetricDifferenceWith: symmetricDifferenceWith,
tail: tail,
take: take,
takeLast: takeLast,
takeLastWhile: takeLastWhile,
takeWhile: takeWhile,
tap: tap,
test: test,
times: times,
toLower: toLower,
toPairs: toPairs,
toPairsIn: toPairsIn,
toString: toString,
toUpper: toUpper,
transduce: transduce,
transpose: transpose,
traverse: traverse,
trim: trim,
tryCatch: tryCatch,
type: type,
unapply: unapply,
unary: unary,
uncurryN: uncurryN,
unfold: unfold,
union: union,
unionWith: unionWith,
uniq: uniq,
uniqBy: uniqBy,
uniqWith: uniqWith,
unless: unless,
unnest: unnest,
until: until,
update: update,
useWith: useWith,
values: values,
valuesIn: valuesIn,
view: view,
when: when,
where: where,
whereEq: whereEq,
without: without,
xprod: xprod,
zip: zip,
zipObj: zipObj,
zipWith: zipWith
};
/* eslint-env amd */
/* TEST_ENTRY_POINT */
if (typeof exports === 'object') {
module.exports = R;
} else if (typeof define === 'function' && define.amd) {
define(function() { return R; });
} else {
this.R = R;
}
}.call(this));