Empty string: Difference between revisions
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// check that string is not empty
s > ""</lang>
=={{header|Haskell}}==
<lang haskell>import Control.Monad
-- In Haskell strings are just lists (of characters), so we can use the function
-- 'null', which applies to all lists. We don't want to use the length, since
-- Haskell allows infinite lists.
main = do
let s = ""
when (null s) (putStrLn "Empty.")
when (not $ null s) (putStrLn "Not empty.")</lang>
=={{header|Icon}} and {{header|Unicon}}==
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