19 Sep
2007
19 Sep
'07
12:13 p.m.
On Wed, 19 Sep 2007, Miguel Mitrofanov wrote:
Now why isn't pattern matching lazy by default? This seems odd for a newbie since everything else is lazy by default.
It's even more confusing that pattern matching in 'let' _is_ lazy.
No, it's not.
See, in let or where constructs you don't have a choice; you can't do different things depending on whether some value is Just x or Nothing. Therefore, there is no need to perform pattern matching strictly.
Then why are patterns in lambdas not lazy?