1  var baseDifference = require('./_baseDifference'),
 2      baseFlatten = require('./_baseFlatten'),
 3      baseIteratee = require('./_baseIteratee'),
 4      baseRest = require('./_baseRest'),
 5      isArrayLikeObject = require('./isArrayLikeObject'),
 6      last = require('./last');
 7  
 8  /**
 9   * This method is like `_.difference` except that it accepts `iteratee` which
10   * is invoked for each element of `array` and `values` to generate the criterion
11   * by which they're compared. The order and references of result values are
12   * determined by the first array. The iteratee is invoked with one argument:
13   * (value).
14   *
15   * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
16   *
17   * @static
18   * @memberOf _
19   * @since 4.0.0
20   * @category Array
21   * @param {Array} array The array to inspect.
22   * @param {...Array} [values] The values to exclude.
23   * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
24   * @returns {Array} Returns the new array of filtered values.
25   * @example
26   *
27   * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
28   * // => [1.2]
29   *
30   * // The `_.property` iteratee shorthand.
31   * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
32   * // => [{ 'x': 2 }]
33   */
34  var differenceBy = baseRest(function(array, values) {
35    var iteratee = last(values);
36    if (isArrayLikeObject(iteratee)) {
37      iteratee = undefined;
38    }
39    return isArrayLikeObject(array)
40      ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), baseIteratee(iteratee, 2))
41      : [];
42  });
43  
44  module.exports = differenceBy;