Empty string: Difference between revisions
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(Add Haskell entry.) |
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// check that string is not empty |
// check that string is not empty |
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s > ""</lang> |
s > ""</lang> |
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=={{header|Haskell}}== |
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<lang 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.")</lang> |
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=={{header|Icon}} and {{header|Unicon}}== |
=={{header|Icon}} and {{header|Unicon}}== |
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