官網鏈接：https://www.learnrxjs.io/learn-rxjs/operators/filtering/takewhile

import { of } from 'rxjs'; import { takeWhile, filter } from 'rxjs/operators';// emit 3, 3, 3, 9, 1, 4, 5, 8, 96, 3, 66, 3, 3, 3 const source$ = of(3, 3, 3, 9, 1, 4, 5, 8, 96, 3, 66, 3, 3, 3);// allow values until value from source equals 3, then complete source$.pipe(takeWhile(it => it === 3))// log: 3, 3, 3.subscribe(val => console.log('takeWhile', val));source$.pipe(filter(it => it === 3))// log: 3, 3, 3, 3, 3, 3, 3.subscribe(val => console.log('filter', val));

區別一目了然：

• takeWhile, 當條件不滿足時，Observable 設置為 completed 狀態，停止 emit 值

• filter, Observable 里所有滿足條件的值都將被 emit

總結

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