On Thu, Jan 30, 2003 at 11:41:49AM +0100, Rijk J. C. van Haaften wrote: > Recently, I came accross this > expression: > [ x + y | x <- xs | y <- ys ] > > As far as I can see (Haskell Report), > this is not allowed by the haskell 98 > standard. So I assume it to be an ex- > tension. Where can I find information > about this?
It's not Haskell 98, but is implemented in GHC and Hugs (with extensions turned on). It's a "parallel list comprehension", and is equivalent to zipWith (+) xs ys See the GHC User's Guide for more. _______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe