Rxjs: toPromise not work

[tossp]

RxJS version: 5.0.1

Code to reproduce: https://jsfiddle.net/tossp/nmf9jg32/

[david-driscoll]

toPromise is essentially observable.last().subscribe()

If you add .take(1) just before you call toPromise then things will start to work.

ie
example.do((value)=>console.log('do!!!',value)).take(1).toPromise()

[tossp]

Thank you so much

[cjk]

I just spend 3 hours fighting toPromise returning _nothing_ and wondering why until I found this issue.
This behaviour was not obvious (to me) when reading the RxJs docs. Still trying to wrap my head around why take(1) solved it for me as well.

[david-driscoll]

@cjk toPromise will never resolve until the observable it is sourced from calls complete. So if you bind to a keyboard event Observable.fromEvent(document, 'onload'), that observable will never complete, unless you force it to through something like take(1).

[lock[bot]]

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