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问题描述
我发现自己想要这个小小的函数,但它似乎不在 Data.Maybe
中。
splat ::(a - > Bool) - > a - >也许是
splat c a
| c a =只是
|否则= Nothing
解决方案 ://hackage.haskell.org/package/monadplusrel =nofollow> monadplus 完全包含这个函数,名为:
partial ::(a - > Bool) - > a - >可能是
I found myself wanting this tiny little function, but it doesn't seem to be in Data.Maybe
. Is it somewhere else?
splat :: (a -> Bool) -> a -> Maybe a
splat c a
| c a = Just a
| otherwise = Nothing
解决方案
The package monadplus contains exactly this function, named partial
:
partial :: (a -> Bool) -> a -> Maybe a
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08-23 10:12