List comprehensions: Difference between revisions
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(→{{header|Haskell}}: Explicitly import guard) |
(→{{header|Haskell}}: Add type signatures) |
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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<lang haskell>pyth |
<lang haskell>pyth :: (Enum t, Eq t, Num t) => t -> [(t, t, t)] |
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pyth n = [(x,y,z) | x <- [1..n], y <- [x..n], z <- [y..n], x^2 + y^2 == z^2] |
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</lang> |
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List-comprehensions in Haskell are in fact syntactic sugar for do-notation, so the above is equivalent to the following: |
List-comprehensions in Haskell are in fact syntactic sugar for do-notation, so the above is equivalent to the following: |
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<lang haskell>import Control.Monad (guard) |
<lang haskell>import Control.Monad (guard) |
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pyth :: (Enum t, Eq t, Num t) => t -> [(t, t, t)] |
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pyth n = do |
pyth n = do |
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x <- [1..n] |
x <- [1..n] |
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