lodash/object/keys.js

define(['../internal/isLength', '../lang/isNative', '../lang/isObject', '../internal/shimKeys'], function(isLength, isNative, isObject, shimKeys) {

  /* Native method references for those with the same name as other `lodash` methods. */
  var nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys;

  /**
   * Creates an array of the own enumerable property names of `object`.
   *
   * **Note:** Non-object values are coerced to objects. See the
   * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.keys)
   * for more details.
   *
   * @static
   * @memberOf _
   * @category Object
   * @param {Object} object The object to inspect.
   * @returns {Array} Returns the array of property names.
   * @example
   *
   * function Foo() {
   *   this.a = 1;
   *   this.b = 2;
   * }
   *
   * Foo.prototype.c = 3;
   *
   * _.keys(new Foo);
   * // => ['a', 'b'] (iteration order is not guaranteed)
   *
   * _.keys('hi');
   * // => ['0', '1']
   */
  var keys = !nativeKeys ? shimKeys : function(object) {
    if (object) {
      var Ctor = object.constructor,
          length = object.length;
    }
    if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
       (typeof object != 'function' && (length && isLength(length)))) {
      return shimKeys(object);
    }
    return isObject(object) ? nativeKeys(object) : [];
  };

  return keys;
});