Joey Perrott
d1ea1f4c7f
Update the license headers throughout the repository to reference Google LLC rather than Google Inc, for the required license headers. PR Close #37205
54 lines
1.6 KiB
TypeScript
54 lines
1.6 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {getSymbolIterator} from './symbol';
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export function isIterable(obj: any): obj is Iterable<any> {
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return obj !== null && typeof obj === 'object' && (obj as any)[getSymbolIterator()] !== undefined;
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}
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export function isListLikeIterable(obj: any): boolean {
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if (!isJsObject(obj)) return false;
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return Array.isArray(obj) ||
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(!(obj instanceof Map) && // JS Map are iterables but return entries as [k, v]
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getSymbolIterator() in obj); // JS Iterable have a Symbol.iterator prop
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}
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export function areIterablesEqual(
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a: any, b: any, comparator: (a: any, b: any) => boolean): boolean {
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const iterator1 = a[getSymbolIterator()]();
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const iterator2 = b[getSymbolIterator()]();
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while (true) {
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const item1 = iterator1.next();
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const item2 = iterator2.next();
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if (item1.done && item2.done) return true;
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if (item1.done || item2.done) return false;
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if (!comparator(item1.value, item2.value)) return false;
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}
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}
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export function iterateListLike(obj: any, fn: (p: any) => any) {
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if (Array.isArray(obj)) {
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for (let i = 0; i < obj.length; i++) {
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fn(obj[i]);
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}
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} else {
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const iterator = obj[getSymbolIterator()]();
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let item: any;
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while (!((item = iterator.next()).done)) {
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fn(item.value);
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}
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}
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}
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export function isJsObject(o: any): boolean {
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return o !== null && (typeof o === 'function' || typeof o === 'object');
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}
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