filter

filter operator omits all values from source that don't match the predicate function

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const { rxObserver } = require('api/v0.3');
const { timer } = require('rxjs');
const { filter, take } = require('rxjs/operators');


const source$ = timer(0, 5).pipe(
    take(4)
  );

const result$ = source$.pipe(
    filter(x => x % 2)
  );

source$.subscribe(rxObserver());
result$.subscribe(rxObserver());

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