Reduce() overload invoked with index=undefined

[crunchie84]

RxJS version:
5.0.3
Code to reproduce:

Rx.Observable.from([1,2,3,4,5])
  .reduce((acc,curr,index) => `${acc}\ncurr:${curr}@index(${index})`, '')
  .subscribe(console.log);

Expected behavior:

curr:1@index(0)
curr:2@index(1)
curr:3@index(2)
curr:4@index(3)
curr:5@index(4)"

Actual behavior:

curr:1@index(undefined)
curr:2@index(undefined)
curr:3@index(undefined)
curr:4@index(undefined)
curr:5@index(undefined)"

Additional information:

The seed argument does not matter, results are the same

[crunchie84]

Note; the index argument is not documented in the documentation of RxJS5 (but was in RxJs4).

The code seems to suggest the overload should work: https://github.com/ReactiveX/rxjs/blob/master/src/operator/reduce.ts#L6-L8

[kwonoj]

Yes, there's mismatch between signature to implementation. Need to be update either case.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.