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henrik-ch/gist:2429157

Created April 20, 2012 14:40
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Haskell list comprehensions
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gistfile1.hs
-- [output function | generators/predicates]
-- like this
[ x * 2| x <- [1..4]]
-- can be read as take x and multiply it with two, and get x from the list consisting of 1 to 4.
-- [2,4,6,8]
-- or like this
[ (x * 2, y - 3)| x <- [1..3], y <- [2..4]]
--[(2,-1),(2,0),(2,1),(4,-1),(4,0),(4,1),(6,-1),(6,0),(6,1)]
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