Pass Types as arguments to a function in Haskell?
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Charles Peng
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Published on 2012-04-06T04:52:38Z
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2012/04/06
11:29 UTC
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The following two functions are extremely similar. They read from a [String] n elements, either [Int] or [Float]. How can I factor the common code out? I don't know of any mechanism in Haskell that supports passing types as arguments.
readInts n stream = foldl next ([], stream) [1..n]
where
next (lst, x:xs) _ = (lst ++ [v], xs)
where
v = read x :: Int
readFloats n stream = foldl next ([], stream) [1..n]
where
next (lst, x:xs) _ = (lst ++ [v], xs)
where
v = read x :: Float
I am at a beginner level of Haskell, so any comments on my code are welcome.
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