List comprehensions: Difference between revisions
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→{{header|AppleScript}}: Updated primitives |
→{{header|Haskell}}: Used mzero rather than [] in immediate desugaring |
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and both of the above could be de-sugared to: |
and both of the above could be de-sugared to: |
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<lang haskell> |
<lang haskell>import Control.Monad (mzero) |
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pyth :: Int -> [(Int, Int, Int)] |
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pyth n = |
pyth n = |
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[1 .. n] >>= |
[1 .. n] >>= |
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case x ^ 2 + y ^ 2 == z ^ 2 of |
case x ^ 2 + y ^ 2 == z ^ 2 of |
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True -> return (x, y, z) |
True -> return (x, y, z) |
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False -> |
False -> mzero)))</lang> |
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which can be further specialised (given the particular context of the list monad, in which >>= is concatMap) to: |
which can be further specialised (given the particular context of the list monad, in which >>= is concatMap) to: |
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