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Filename : intersectionWith.js
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var arrayMap = require('./_arrayMap'),
    baseIntersection = require('./_baseIntersection'),
    baseRest = require('./_baseRest'),
    castArrayLikeObject = require('./_castArrayLikeObject'),
    last = require('./last');

/**
 * This method is like `_.intersection` except that it accepts `comparator`
 * which is invoked to compare elements of `arrays`. The order and references
 * of result values are determined by the first array. The comparator is
 * invoked with two arguments: (arrVal, othVal).
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Array
 * @param {...Array} [arrays] The arrays to inspect.
 * @param {Function} [comparator] The comparator invoked per element.
 * @returns {Array} Returns the new array of intersecting values.
 * @example
 *
 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
 * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
 *
 * _.intersectionWith(objects, others, _.isEqual);
 * // => [{ 'x': 1, 'y': 2 }]
 */
var intersectionWith = baseRest(function(arrays) {
  var comparator = last(arrays),
      mapped = arrayMap(arrays, castArrayLikeObject);

  comparator = typeof comparator == 'function' ? comparator : undefined;
  if (comparator) {
    mapped.pop();
  }
  return (mapped.length && mapped[0] === arrays[0])
    ? baseIntersection(mapped, undefined, comparator)
    : [];
});

module.exports = intersectionWith;