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Filename : xorBy.js
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var arrayFilter = require('./_arrayFilter'),
    baseIteratee = require('./_baseIteratee'),
    baseRest = require('./_baseRest'),
    baseXor = require('./_baseXor'),
    isArrayLikeObject = require('./isArrayLikeObject'),
    last = require('./last');

/**
 * This method is like `_.xor` except that it accepts `iteratee` which is
 * invoked for each element of each `arrays` to generate the criterion by
 * which by which they're compared. The order of result values is determined
 * by the order they occur in the arrays. The iteratee is invoked with one
 * argument: (value).
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Array
 * @param {...Array} [arrays] The arrays to inspect.
 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
 * @returns {Array} Returns the new array of filtered values.
 * @example
 *
 * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
 * // => [1.2, 3.4]
 *
 * // The `_.property` iteratee shorthand.
 * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
 * // => [{ 'x': 2 }]
 */
var xorBy = baseRest(function(arrays) {
  var iteratee = last(arrays);
  if (isArrayLikeObject(iteratee)) {
    iteratee = undefined;
  }
  return baseXor(arrayFilter(arrays, isArrayLikeObject), baseIteratee(iteratee, 2));
});

module.exports = xorBy;