2 Nov
2010
2 Nov
'10
5:11 a.m.
On Mon, Nov 1, 2010 at 7:23 PM, uu1101@gmail.com
* _ is not a special keyword in haskell. It's a regular variable so will always match. It's usually used when you don't use it's value in the right hand side or when it adds no information. In this case its value will be n so there is no reason to introduce another name.
This is incorrect. _ is a pattern not a variable. I can write f (_:_) = "bla" but not f (x:x) = "bla" Conflicting definitions for `x' In the definition of `f' So _ is a pattern that always matches but is never bound to a value. Regards, Roel