List comprehensions: Difference between revisions
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(→{{header|Haskell}}: List-comprehension is just sugar for do-notation.) |
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<lang haskell>pyth n = [(x,y,z) | x <- [1..n], y <- [x..n], z <- [y..n], x^2 + y^2 == z^2]</lang> |
<lang haskell>pyth n = [(x,y,z) | x <- [1..n], y <- [x..n], z <- [y..n], x^2 + y^2 == z^2]</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: |
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Since lists are [http://haskell.org/haskellwiki/Monad monads], one can alternatively also use the do-notation (which is practical if the comprehension is large): |
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<lang haskell>import Control.Monad |
<lang haskell>import Control.Monad |
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