@angular/core
Version:
Angular - the core framework
30 lines • 3.48 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { global as _global } from './global';
let _symbolIterator = null;
export function getSymbolIterator() {
if (!_symbolIterator) {
const Symbol = _global['Symbol'];
if (Symbol && Symbol.iterator) {
_symbolIterator = Symbol.iterator;
}
else {
// es6-shim specific logic
const keys = Object.getOwnPropertyNames(Map.prototype);
for (let i = 0; i < keys.length; ++i) {
const key = keys[i];
if (key !== 'entries' && key !== 'size' &&
Map.prototype[key] === Map.prototype['entries']) {
_symbolIterator = key;
}
}
}
}
return _symbolIterator;
}
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