@angular/router
Version:
Angular - the routing library
69 lines • 7.91 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
*/
import { ɵisPromise as isPromise } from '@angular/core';
import { from, isObservable, of } from 'rxjs';
export function shallowEqualArrays(a, b) {
if (a.length !== b.length)
return false;
for (let i = 0; i < a.length; ++i) {
if (!shallowEqual(a[i], b[i]))
return false;
}
return true;
}
export function shallowEqual(a, b) {
// While `undefined` should never be possible, it would sometimes be the case in IE 11
// and pre-chromium Edge. The check below accounts for this edge case.
const k1 = a ? Object.keys(a) : undefined;
const k2 = b ? Object.keys(b) : undefined;
if (!k1 || !k2 || k1.length != k2.length) {
return false;
}
let key;
for (let i = 0; i < k1.length; i++) {
key = k1[i];
if (!equalArraysOrString(a[key], b[key])) {
return false;
}
}
return true;
}
/**
* Test equality for arrays of strings or a string.
*/
export function equalArraysOrString(a, b) {
if (Array.isArray(a) && Array.isArray(b)) {
if (a.length !== b.length)
return false;
const aSorted = [...a].sort();
const bSorted = [...b].sort();
return aSorted.every((val, index) => bSorted[index] === val);
}
else {
return a === b;
}
}
/**
* Return the last element of an array.
*/
export function last(a) {
return a.length > 0 ? a[a.length - 1] : null;
}
export function wrapIntoObservable(value) {
if (isObservable(value)) {
return value;
}
if (isPromise(value)) {
// Use `Promise.resolve()` to wrap promise-like instances.
// Required ie when a Resolver returns a AngularJS `$q` promise to correctly trigger the
// change detection.
return from(Promise.resolve(value));
}
return of(value);
}
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