lodash/forIn.js

define(['./_baseCastFunction', './_baseFor', './keysIn'], function(baseCastFunction, baseFor, keysIn) {

  /**
   * Iterates over own and inherited enumerable properties of an object invoking
   * `iteratee` for each property. The iteratee is invoked with three arguments:
   * (value, key, object). Iteratee functions may exit iteration early by explicitly
   * returning `false`.
   *
   * @static
   * @memberOf _
   * @category Object
   * @param {Object} object The object to iterate over.
   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
   * @returns {Object} Returns `object`.
   * @example
   *
   * function Foo() {
   *   this.a = 1;
   *   this.b = 2;
   * }
   *
   * Foo.prototype.c = 3;
   *
   * _.forIn(new Foo, function(value, key) {
   *   console.log(key);
   * });
   * // => logs 'a', 'b', then 'c' (iteration order is not guaranteed)
   */
  function forIn(object, iteratee) {
    return object == null
      ? object
      : baseFor(object, baseCastFunction(iteratee), keysIn);
  }

  return forIn;
});