filter | Le Guide Angular

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import { from } from 'rxjs';
import { filter } from 'rxjs/operators';

const getTemperature = city => 100 / city.length;

/* Create an Observable from an array : Strasbourg => Nice => Lyon. */
const city$ = from(['Strasbourg', 'Nice', 'Lyon']);

const hotCity$ = city$
    .pipe(filter(city => getTemperature(city) > 20));

hotCity$.subscribe(city => console.log(city));