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/**
* Copyright 2013-present, 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.
*
*
*/
'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;
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