var _curry1 = require('./internal/_curry1');
var empty = require('./empty');
var equals = require('./equals');


/**
 * 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
 */
module.exports = _curry1(function isEmpty(x) {
  return x != null && equals(x, empty(x));
});