[Haskell-cafe] Odd lack of laziness
chaddai.fouche at gmail.com
Sat Jun 23 05:38:42 EDT 2007
2007/6/22, Andrew Coppin <andrewcoppin at btinternet.com>:
> 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
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