1  var baseIteratee = require('./_baseIteratee'),
 2      baseUniq = require('./_baseUniq');
 3  
 4  /**
 5   * This method is like `_.uniq` except that it accepts `iteratee` which is
 6   * invoked for each element in `array` to generate the criterion by which
 7   * uniqueness is computed. The order of result values is determined by the
 8   * order they occur in the array. The iteratee is invoked with one argument:
 9   * (value).
10   *
11   * @static
12   * @memberOf _
13   * @since 4.0.0
14   * @category Array
15   * @param {Array} array The array to inspect.
16   * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
17   * @returns {Array} Returns the new duplicate free array.
18   * @example
19   *
20   * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
21   * // => [2.1, 1.2]
22   *
23   * // The `_.property` iteratee shorthand.
24   * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
25   * // => [{ 'x': 1 }, { 'x': 2 }]
26   */
27  function uniqBy(array, iteratee) {
28    return (array && array.length) ? baseUniq(array, baseIteratee(iteratee, 2)) : [];
29  }
30  
31  module.exports = uniqBy;