59 lines
1.4 KiB
TypeScript
59 lines
1.4 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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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/**
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* Must use this method for CD (instead of === ) since NaN !== NaN
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*/
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export function isDifferent(a: any, b: any): boolean {
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// NaN is the only value that is not equal to itself so the first
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// test checks if both a and b are not NaN
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return !(a !== a && b !== b) && a !== b;
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}
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export function stringify(value: any): string {
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if (typeof value == 'function') return value.name || value;
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if (typeof value == 'string') return value;
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if (value == null) return '';
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return '' + value;
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}
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/**
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* Function that throws a "not implemented" error so it's clear certain
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* behaviors/methods aren't yet ready.
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*
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* @returns Not implemented error
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*/
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export function notImplemented(): Error {
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return new Error('NotImplemented');
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}
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/**
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* Flattens an array in non-recursive way. Input arrays are not modified.
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*/
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export function flatten(list: any[]): any[] {
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const result: any[] = [];
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let i = 0;
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while (i < list.length) {
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const item = list[i];
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if (Array.isArray(item)) {
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if (item.length > 0) {
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list = item.concat(list.slice(i + 1));
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i = 0;
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} else {
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i++;
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}
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} else {
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result.push(item);
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i++;
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}
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}
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return result;
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}
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