30 Jan
2003
30 Jan
'03
11:08 a.m.
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.