11 lines
322 B
Haskell
11 lines
322 B
Haskell
import Control.Monad
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-- In Haskell strings are just lists (of characters), so we can use the function
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-- 'null', which applies to all lists. We don't want to use the length, since
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-- Haskell allows infinite lists.
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main = do
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let s = ""
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when (null s) (putStrLn "Empty.")
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when (not $ null s) (putStrLn "Not empty.")
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