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rxjs

Thankful Thrush answered on July 15, 2021 Popularity 2/10 Helpfulness 1/10

answer rxjs

rxjs

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// Think of RxJS as Lodash for events.
import { Observable } from 'rxjs';
import { of } from 'rxjs';
import { first } from 'rxjs/operators';

const observable = new Observable(subscriber => {
  subscriber.next(1);
  subscriber.next(2);
  subscriber.next(3);
  setTimeout(() => {
    subscriber.next(4);
    subscriber.complete();
  }, 1000);
});

console.log('just before subscribe');
observable.subscribe({
  next(x) { console.log('got value ' + x); },
  error(err) { console.error('something wrong occurred: ' + err); },
  complete() { console.log('done'); }
});
console.log('just after subscribe');

/**
just before subscribe
got value 1
got value 2
got value 3
just after subscribe
got value 4
done
**/

of(1, 2, 3)
  .pipe(first())
  .subscribe((v) => console.log(`value: ${v}`));

// Logs:
// value: 1

Popularity 2/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript rxjs

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Contributed on Jul 15 2021

Thankful Thrush

0 Answers Avg Quality 2/10

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