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Diffstat (limited to 'node_modules/react-dom/lib/getIteratorFn.js')
-rw-r--r-- | node_modules/react-dom/lib/getIteratorFn.js | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/getIteratorFn.js b/node_modules/react-dom/lib/getIteratorFn.js new file mode 100644 index 000000000..95eed4221 --- /dev/null +++ b/node_modules/react-dom/lib/getIteratorFn.js @@ -0,0 +1,40 @@ +/** + * 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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