var _curry1 = require('./internal/_curry1');
var curryN = require('./curryN');
var nth = require('./nth');


/**
 * 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
 */
module.exports = _curry1(function nthArg(n) {
  var arity = n < 0 ? 1 : n + 1;
  return curryN(arity, function() {
    return nth(n, arguments);
  });
});