@angular/core
Version:
Angular - the core framework
49 lines • 6.06 kB
JavaScript
/**
* @license
* Copyright Google LLC 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
*/
export function isIterable(obj) {
return obj !== null && typeof obj === 'object' && obj[Symbol.iterator] !== undefined;
}
export function isListLikeIterable(obj) {
if (!isJsObject(obj))
return false;
return (Array.isArray(obj) ||
(!(obj instanceof Map) && // JS Map are iterables but return entries as [k, v]
Symbol.iterator in obj)); // JS Iterable have a Symbol.iterator prop
}
export function areIterablesEqual(a, b, comparator) {
const iterator1 = a[Symbol.iterator]();
const iterator2 = b[Symbol.iterator]();
while (true) {
const item1 = iterator1.next();
const item2 = iterator2.next();
if (item1.done && item2.done)
return true;
if (item1.done || item2.done)
return false;
if (!comparator(item1.value, item2.value))
return false;
}
}
export function iterateListLike(obj, fn) {
if (Array.isArray(obj)) {
for (let i = 0; i < obj.length; i++) {
fn(obj[i]);
}
}
else {
const iterator = obj[Symbol.iterator]();
let item;
while (!(item = iterator.next()).done) {
fn(item.value);
}
}
}
export function isJsObject(o) {
return o !== null && (typeof o === 'function' || typeof o === 'object');
}
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