[Haskell-cafe] Lazy Lists and IO

Stefan O'Rear stefanor at cox.net
Wed Jul 11 17:14:31 EDT 2007

On Wed, Jul 11, 2007 at 09:54:10PM +0100, Andrew Coppin wrote:
> Chaddaï Fouché wrote:
>> There is already many thing in standard library. The balance is important.
> I agree.
> The question is whether we mind lots of people reimplementing this 
> themselves, each using their own different name for it. I believe I read 
> about some plan to add a trivial function named "on" to one of the standard 
> libraries, because having it there makes code more readable. So the 
> question becomes "does putting this thing in the library make people's code 
> clearer, or is the function trivial enough to reimplement that one can 
> readily see what it's for?"
> I'd prefer it in the library (probably Data.List), but it's no biggie.

Interestingly, the function is already there; it's called genericLength.

However, the lazy natural type isn't.

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