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38 lines
997 B
38 lines
997 B
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* |
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*/ |
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'use strict'; |
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/* global Symbol */ |
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var ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator; |
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var FAUX_ITERATOR_SYMBOL = '@@iterator'; // Before Symbol spec. |
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/** |
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* Returns the iterator method function contained on the iterable object. |
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* |
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* Be sure to invoke the function with the iterable as context: |
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* |
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* var iteratorFn = getIteratorFn(myIterable); |
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* if (iteratorFn) { |
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* var iterator = iteratorFn.call(myIterable); |
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* ... |
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* } |
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* |
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* @param {?object} maybeIterable |
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* @return {?function} |
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*/ |
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function getIteratorFn(maybeIterable) { |
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var iteratorFn = maybeIterable && (ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]); |
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if (typeof iteratorFn === 'function') { |
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return iteratorFn; |
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} |
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} |
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module.exports = getIteratorFn; |