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Word frequency: Difference between revisions
simplify
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module Main where
import
import Data.
import
import Data.Ord (Down(..))
import System.IO (stdin, IOMode(..), openFile, hClose)
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main = do
args <- getArgs
when (length args /= 1) (error "expecting 1 arg (number of words to print)")
let maxw = read $ head args -- no error handling, to simplify the example
▲ T.hGetContents hand >>= \contents -> do
freqtable <- frequencies $ filter (not . T.null) $ T.split isSpace $ T.map toLower contents
counts <-
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cnt <- readIORef ref
return (w, cnt)
in mapM readRef $ M.toList freqtable
print $ take maxw $ sortOn
</lang>
{{Out}}
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