Created
May 24, 2023 11:39
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This code show how to play with objects and maps to revert the values and filter them
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| import {expect} from "@jest/globals"; | |
| import {map, of} from "rxjs"; | |
| function matchesAny(tuples: [string, string][], prefix: string) { | |
| return tuples.filter(t => matches(t, prefix)); | |
| } | |
| function matches(tuple: [string, string], prefix: string) { | |
| return tuple[0].startsWith(prefix) | |
| } | |
| describe('Maps', () => { | |
| it('should reverse map', () => { | |
| let data = { | |
| "foobar.cert": ["info.foo", "error.bar", "info.baz"], | |
| "foobaz.cert": ["info.foo", "error.bar", "info.baz"], | |
| "foobarbaz.cert": ["info.foo", "error.bar", "error.baz"], | |
| "foobazbar.cert": ["info.foo", "info.bar"], | |
| }; | |
| let observable = of(data); | |
| let batchResult$ = observable.pipe( | |
| map(res => new Map(Object.entries(res))), | |
| map( mapOf => { | |
| let reverseLookup: [string, string][] = []; | |
| mapOf.forEach((messages, cert) => { | |
| messages.reduce((acc, msg) => { | |
| acc.push([msg, cert]); | |
| return acc; | |
| }, reverseLookup); | |
| }); | |
| return reverseLookup; | |
| }) | |
| ); | |
| let info$ = batchResult$.pipe( | |
| map(tuples => matchesAny(tuples, "info")) | |
| ); | |
| info$.subscribe(tuples => { | |
| tuples.forEach(t => { | |
| expect(t[0]).toMatch("^info") | |
| }) | |
| }); | |
| let error$ = batchResult$.pipe( | |
| map(tuples => matchesAny(tuples, "error")) | |
| ); | |
| error$.subscribe(tuples => { | |
| tuples.forEach(t => { | |
| expect(t[0]).toMatch("^error") | |
| }) | |
| }); | |
| }); | |
| }); |
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