[Haskell-cafe] what does ' mean?
yin at atom.sk
Sun Jul 17 18:30:42 EDT 2005
Logesh Pillay wrote:
> I found the following code on the web
> /-- Andrew Bromage
> /-- If you're doing permutations, then I suppose you want this too:
> //-- (subLists might be a more suggestive name)
> /combinations *:: [a] -> [[a]]
> *combinations  = []
> combinations (x:xs)
> = combinations xs ++ [ x:xs' | xs' <- combinations xs ]
> What does ' (apostrophe) mean? I see no reference to it in Simon
> Thompson's book.
' nothing. xs' does the same as xs_, or _xs, or xs2, but it's readable.
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