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  1. import qualified Data.Map as Map
  2.  
  3. frequencies = Map.toList . foldr (flip (Map.insertWith (+)) 1) Map.empty
  4.  
  5. main = print $ frequencies "huipizdadjigurda"
  6.  
Success #stdin #stdout 0s 6244KB
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stdin
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Standard input is empty
stdout
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[('a',2),('d',3),('g',1),('h',1),('i',3),('j',1),('p',1),('r',1),('u',2),('z',1)]
https://ideone.com/mem1SO
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
public

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