Library enhancement request: Data.Maybe.justIf
Hi,
I found myself often writing the idiom "if a then Just v else Nothing". It can be nicely abbreviated by the function:
justIf :: a -> Bool -> Just a
justIf x True = Just x
justIf x False = Nothing
Which would allow me to write the nicely write- and readable v
justIf a
.
Asking on #haskell, I got positive feedback about this addition:
<endojelly> nomeata, I'm all for it. my last project was *full* of that idiom
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.4 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
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