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tap



Read passing data without changing it:

1linkfunction tap<T>(do: (t: T) => void): (src: Source<T>) => Source<T>

1link​import { tap, interval, map, subscribe, pipe, filter } from 'callbag-common';

2link​

3link​pipe(

4link​  interval(1000),

5link​  tap(v => console.log('Before: ' + v)),

6link​  map(x => x * 3),

7link​  filter(x => x % 2 === 0),

8link​  subscribe(v => console.log('After: ' + v))

9link​)

10link​

 Before: 0
 After: 0
 Before: 1
 Before: 2
 After: 6
 Before: 3
 Before: 4
 After: 12
 ...
► Try It!

👉 tap() is useful for debugging as well as side-effects.



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