1  var baseUpdate = require('./_baseUpdate'),
 2      castFunction = require('./_castFunction');
 3  
 4  /**
 5   * This method is like `_.set` except that accepts `updater` to produce the
 6   * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
 7   * is invoked with one argument: (value).
 8   *
 9   * **Note:** This method mutates `object`.
10   *
11   * @static
12   * @memberOf _
13   * @since 4.6.0
14   * @category Object
15   * @param {Object} object The object to modify.
16   * @param {Array|string} path The path of the property to set.
17   * @param {Function} updater The function to produce the updated value.
18   * @returns {Object} Returns `object`.
19   * @example
20   *
21   * var object = { 'a': [{ 'b': { 'c': 3 } }] };
22   *
23   * _.update(object, 'a[0].b.c', function(n) { return n * n; });
24   * console.log(object.a[0].b.c);
25   * // => 9
26   *
27   * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
28   * console.log(object.x[0].y.z);
29   * // => 0
30   */
31  function update(object, path, updater) {
32    return object == null ? object : baseUpdate(object, path, castFunction(updater));
33  }
34  
35  module.exports = update;