Haskell/Understanding monads/Solutions/IO
Print a list of arbitrary valuesEdit
The function map
would print out every value from the list, but would produce [IO ()]
. We'd thus need to chain sequence $ map
, which is exactly how the function mapM
is defined. Because we are not collecting the results of print
but focus only on its actions, we can discard them with mapM_
.
printList :: Show a => [a] -> IO ()
printList = mapM_ print