react app

react-app/node_modules/react/lib/getIteratorFn.js

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+/**
+ * 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;