lodash/object/forIn.js

define(['../internal/baseFor', '../internal/bindCallback', './keysIn'], function(baseFor, bindCallback, keysIn) {

  /**
   * Iterates over own and inherited enumerable properties of an object invoking
   * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked
   * with three arguments; (value, key, object). Iterator 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.
   * @param {*} [thisArg] The `this` binding of `iteratee`.
   * @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', and 'c' (iteration order is not guaranteed)
   */
  function forIn(object, iteratee, thisArg) {
    if (typeof iteratee != 'function' || typeof thisArg != 'undefined') {
      iteratee = bindCallback(iteratee, thisArg, 3);
    }
    return baseFor(object, iteratee, keysIn);
  }

  return forIn;
});