Skip to content

Instantly share code, notes, and snippets.

@dripolles

dripolles/empytIndices.hs

Created March 31, 2014 16:10
Show Gist options
  • Save dripolles/9895861 to your computer and use it in GitHub Desktop.
Save dripolles/9895861 to your computer and use it in GitHub Desktop.
Download ZIP
1HaskellADay 2014/03/31
Raw
empytIndices.hs
import Data.Maybe
emptyIndices :: [Maybe a] -> [Int]
emptyIndices = map fst . filter (isNothing . snd) . zip [0..]
main = do
print $ emptyIndices [Just 1,Nothing,Just 2,Nothing,Nothing,Just 3]
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment