You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.2 KiB
42 lines
1.2 KiB
/** |
|
* Copyright 2013-2015, Facebook, Inc. |
|
* All rights reserved. |
|
* |
|
* This source code is licensed under the BSD-style license found in the |
|
* LICENSE file in the root directory of this source tree. An additional grant |
|
* of patent rights can be found in the PATENTS file in the same directory. |
|
* |
|
* @providesModule getIteratorFn |
|
* @typechecks static-only |
|
*/ |
|
|
|
'use strict'; |
|
|
|
/* global Symbol */ |
|
var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator; |
|
var FAUX_ITERATOR_SYMBOL = '@@iterator'; // Before Symbol spec. |
|
|
|
/** |
|
* Returns the iterator method function contained on the iterable object. |
|
* |
|
* Be sure to invoke the function with the iterable as context: |
|
* |
|
* var iteratorFn = getIteratorFn(myIterable); |
|
* if (iteratorFn) { |
|
* var iterator = iteratorFn.call(myIterable); |
|
* ... |
|
* } |
|
* |
|
* @param {?object} maybeIterable |
|
* @return {?function} |
|
*/ |
|
function getIteratorFn(maybeIterable) { |
|
var iteratorFn = maybeIterable && ( |
|
(ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]) |
|
); |
|
if (typeof iteratorFn === 'function') { |
|
return iteratorFn; |
|
} |
|
} |
|
|
|
module.exports = getIteratorFn;
|
|
|