Logesh Pillay <[EMAIL PROTECTED]> wrote: > Dear list > > A v. newbie question. > > 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.
In Haskell, ' following a letter or number in a variable name is considered a part of the variable name. So, xs' is just a variable name distinct from xs. Jon Cast _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
