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mergeScan()'s accumulator doesn't receive any index parameter #4441

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martinsik opened this issue Dec 29, 2018 · 0 comments
Closed

mergeScan()'s accumulator doesn't receive any index parameter #4441

martinsik opened this issue Dec 29, 2018 · 0 comments
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@martinsik
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martinsik commented Dec 29, 2018 •
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Bug Report

Current Behavior
When using mergeScan() its accumulator function never receives index like all other operators.

https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/mergeScan.ts#L48

Reproduction

mergeScan((acc, v, index) => {
  // index will be always `undefined`
}, null)

Expected behavior
The accumulator function should receive index parameter with ever increasing numbers for every emission from source like scan or mergeMap do.

https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/mergeMap.ts#L13
https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/scan.ts#L7

Environment

  • Runtime: all
  • RxJS version: 6.3.3
@martinsik martinsik mentioned this issue Dec 30, 2018
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martinsik added a commit to martinsik/rxjs that referenced this issue Jan 8, 2019
@martinsik
feat(mergeScan): add index to the accumulator function
ad6c91a 
Closes ReactiveX#4441
@martinsik martinsik mentioned this issue Jan 8, 2019
Merged
@benlesh benlesh added the feature PRs and issues for features label Jan 16, 2019
benlesh pushed a commit that referenced this issue Jan 30, 2019
@martinsik @benlesh
feat(mergeScan): Add index to the accumulator function (#4458)
f5e143d 
* feat(mergeScan): add index to the accumulator function

Closes #4441

* test(mergeScan): use marbles instead of "of()"

* test(mergeScan): update spec, remove unnecessary dtest

* readd index lost in merge.
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@martinsik @benlesh