https://github.com/Andarist/callbag-remember

👜 Callbag operator that remembers last event, so that a newly added listener will immediately receive that memorised event.
https://github.com/Andarist/callbag-remember

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Last synced: 16 days ago
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👜 Callbag operator that remembers last event, so that a newly added listener will immediately receive that memorised event.

• Host: GitHub
• URL: https://github.com/Andarist/callbag-remember
• Owner: Andarist
• Created: 2018-03-30T12:54:25.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2021-01-26T09:52:18.000Z (almost 4 years ago)
• Last Synced: 2024-10-20T06:23:05.669Z (22 days ago)
• Topics: callbag, callbags
• Language: JavaScript
• Homepage:
• Size: 14.6 KB
• Stars: 3
• Watchers: 2
• Forks: 3
• Open Issues: 3
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-callbags - remember

README

        
# callbag-remember

Callbag operator which shares input stream between subscribers and emits last emitted value upon subscription. It behaves pretty much as Rx's [`.shareReplay(1)`](https://www.learnrxjs.io/operators/multicasting/sharereplay.html).

## Example

```js

import fromEvent from 'callbag-from-event'

import forEach from 'callbag-for-each'

import map from 'callbag-map'

import merge from 'callbag-merge'

import pipe from 'callbag-pipe'

import remember from 'callbag-remember'

const focus$ = remember(

  merge(

    map(() => false)(fromEvent(window, 'blur')),

    map(() => true)(fromEvent(window, 'focus')),

  ),

)

pipe(

  focus$,

  forEach(tabFocused => {

    // ...

  }),

)

// ...

setTimeout(() => {

  pipe(

    focus$,

    forEach(tabFocused => {

      // ... will get last emitted value immediately

    }),

  )

}, 1000)

```