rxjs

I. 시각화 사이트

RXVIZ - RXVIZRXVIZ

RxMarbles: Interactive diagrams of Rx Observablesrxmarbles.com

II. 자주 사용된 스크립트

1. 먼저 응답이 온 Observable만 받아오기 (race)

//take the first observable to emit
race(
  //emit every 1.5s
  interval(1500).pipe(mapTo('aaaaaaaa')),
  //emit every 1s
  interval(1000).pipe(mapTo('bbbbbb')),
  //emit every 2s
  interval(2000).pipe(mapTo('cccccc')),
  //emit every 2.5s
  interval(2500).pipe(mapTo('ddddd')),
);

//output: bbbbbb (1초) bbbbbb (1초) bbbbbb

2. 모든 응답이 오고 방출하기 (zip)

const sourceOne = of('Hello');
const sourceTwo = of('World!');
const sourceThree = of('Goodbye');
const sourceFour = of('World!');

zip(
  sourceOne,
  sourceTwo.pipe(delay(1000)),
  sourceThree.pipe(delay(2000)),
  sourceFour.pipe(delay(3000))
);
//output: (3초 후...) ["Hello", "World!", "Goodbye", "World!"]

3. 마지막 응답 pushing 할때 자주사용 (shareReplay)

https://www.learnrxjs.io/learn-rxjs/operators/multicasting/sharereplay