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Result.sequence #519

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berdario opened this Issue Mar 6, 2016 · 1 comment

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@berdario @jvoigtlaender
@berdario

berdario commented Mar 6, 2016

I couldn't find this when I needed, and I implemented it myself

resultSequence : List (Result x a) -> Result x (List a)
resultSequence xs = case xs of
    [] -> Ok []
    result :: rest -> Result.map2 (::) result (resultSequence rest)

I would expect this to be available, by simmetry with Task.

I haven't found anyone asking for this earlier in this bug tracker, but maybe it might still be of interest?

PS:

I just realized that there's a elm-result-extra... due to the policy of keeping elm-core lean, maybe this should be proposed to be included there, at first?
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jvoigtlaender Mar 6, 2016

Contributor

Regarding the PS: Yes, indeed, see https://github.com/elm-lang/core/blob/master/CONTRIBUTING.md#adding-new-functions.

And indeed, the function seems to already exist there, http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#combine.
Contributor

jvoigtlaender commented Mar 6, 2016

Regarding the PS: Yes, indeed, see https://github.com/elm-lang/core/blob/master/CONTRIBUTING.md#adding-new-functions.

And indeed, the function seems to already exist there, http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#combine.

@jvoigtlaender jvoigtlaender closed this Mar 6, 2016

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