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  1. import Data.Traversable
  2.  
  3. main = do
  4. 	let a = traverse (\x -> if x > 4 then Just x else Nothing) [1..]
  5. 	print a
  6. 	print "done"
Success #stdin #stdout 0s 6280KB
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stdin
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Standard input is empty
stdout
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Nothing
"done"
https://ideone.com/GuytMd
language:
Haskell (ghc 8.4.4)
created:
10 years ago
visibility:
public

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