On 11/2/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
G'day all.Quoting Bernie Pope <[EMAIL PROTECTED]>: > This is a weird example of a pattern binding, and it is surprising > (to me) that the syntax is valid. Maybe. But you wouldn't balk at this: numzeroes xs = sum [ 1 | 0 <- xs ] ...even if you wouldn't naturally express it that way. Patterns like this are useful in places other than lets. I'd find it more surprising if lets were treated as a special case.
Actually, I had to try it out to see if it would work. That's a neat little trick. I had known that this similar one worked but it uses pattern matching on a data constructor so I never questioned it: numJusts xs = sum [ 1 | Just x <- xs ] thanks, Jason _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
