Re: [Haskell-cafe] Odd lack of laziness

2007/6/22, Andrew Coppin :

Chaddaï Fouché wrote:

...

You should be using BS.null f rather than BS.length f > 0.

While we're on the subject... anybody know a neat way to check, say, whether a list contains exactly 1 element? (Obviously pattern matching can do it, but that requires big case-expressions...)

Big case-expression ? isLength1 [x] = "Ok" isLength _ = "Nok" How is [x] big in any way ? If you need to test for more than one element you can just put put a guard with length -- Jedaï