delay
signature: delay(delay: number | Date, scheduler: Scheduler): Observable
delay(delay: number | Date, scheduler: Scheduler): Observable
주어진 시간만큼 기다린 후 값을 내보냅니다.
예시
예시 1: 마우스를 길게 누르는것을 인식할 때까지 기다립니다
( StackBlitz )
import { fromEvent, of } from 'rxjs';
import { mergeMap, delay, takeUntil } from 'rxjs/operators';
const mousedown$ = fromEvent(document, 'mousedown');
const mouseup$ = fromEvent(document, 'mouseup');
mousedown$
.pipe(
mergeMap(event =>
of(event).pipe(
delay(700),
takeUntil(mouseup$)
)
)
)
.subscribe(event => console.log('Long Press!', event));
예시 2: Delay for increasing durations
( StackBlitz )
// RxJS v6+
import { of, merge } from 'rxjs';
import { mapTo, delay } from 'rxjs/operators';
//아이템 하나를 내보냅니다
const example = of(null);
//각각의 결과값을 추가 시간만큼 늦춥니다
const message = merge(
example.pipe(mapTo('Hello')),
example.pipe(
mapTo('World!'),
delay(1000)
),
example.pipe(
mapTo('Goodbye'),
delay(2000)
),
example.pipe(
mapTo('World!'),
delay(3000)
)
);
//결과: 'Hello'...'World!'...'Goodbye'...'World!'
const subscribe = message.subscribe(val => console.log(val));
관련된 사용법
[Save Indicator]('../../recipes/save-indicator.md)
추가 자료
delay 📰 - 공식 문서
Transformation operator: delay and delayWhen 📹 💵 - André Staltz
📂 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/delay.ts
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