collectValues()

A pipeable operator that collects all the GroupedObservables emitted by the source and emits a Map with the latest values of the inner Observables.

function collectValues<K, V>(): OperatorFunction<GroupedObservable<K, V>, Map<K, V>>

Returns

OperatorFunction<GroupedObservable<K, V>, Map<K, V>>: An Observable that emits a Map with the latest value for each key in the source grouped Observables.

Example

import { Subject } from 'rxjs'
import { mapTo, scan, takeWhile } from 'rxjs/operators'
import { collectValues, split } from '@react-rxjs/utils'
const votesByKey$ = new Subject<{ key: string }>()
const counters$ = votesByKey$.pipe(
split(
(vote) => vote.key,
(votes$) =>
votes$.pipe(
mapTo(1),
scan((count) => count + 1),
takeWhile((count) => count < 3),
),
),
collectValues(),
)
counters$.subscribe((counters) => {
console.log("counters$:")
counters.forEach((value, key) => {
console.log(`${key}: ${value}`)
})
})
votesByKey$.next({ key: "foo" })
// > counters$:
// > foo: 1
votesByKey$.next({ key: "foo" })
// > counters$:
// > foo: 2
votesByKey$.next({ key: "bar" })
// > counters$:
// > foo: 2
// > bar: 1
votesByKey$.next({ key: "foo" })
// > counters$:
// > bar: 1
votesByKey$.next({ key: "bar" })
// > counters$:
// > bar: 2
//
votesByKey$.next({ key: "bar" })
// > counters$:

See also