[Haskell-beginners] Understanding some notation

Benjamin Edwards edwards.benj at gmail.com
Mon Jun 27 00:55:53 CEST 2011

On 26 June 2011 23:48, Jack Henahan <jhenahan at uvm.edu> wrote:

> I know the type signature of (++), I'm just not seeing `n` as a list, I
> suppose. I'm reading it as being the Int that is passed to splitAt, though
> perhaps my thought process is just wonky.

Look at the type of splitAt, the answers are all in the types :)

splitAt :: Int -> [a] -> ([a],[a])

So when you do a case match on the result of

splitAt x (y:ys)

you must be matching on a tuple of lists, because that's what the return
type of the list is
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