"fold": a replacement for "reduce"

[monarch_dodra]

On Tuesday, 25 March 2014 at 18:21:25 UTC, Meta wrote:
> Sounds to me like the fact that it throws an Exception instead 
> of an Error is a leftover from the earlier days of ranges, when 
> it wasn't clear what one should do in the case of an empty 
> range. I think it's well worth making fold nothrow, and it will 
> simplify calling code in the case where the callee wrapped 
> reduce in a try-catch block.

Well, 1 thing I just thought of is that if you are operating on a 
"non-range iterable": Then it may not be possible to actually 
know if the iterable will loop more than once. So in this case, 
we'd have to keep the enforce for iterables...