Short-circuit prod(f,itr) if itr contains 0?

question

#1

Does prod(f,itr) short-circuit if itr contains 0?


#2

No. Currently it just uses reduce with *. You can try it with @time prod(0:1_000_000), and see that it takes significantly longer than @time prod(0:100_000).

But I’m not sure if it should? There would be some overhead to checking for iszero, and it wouldn’t work for iterables of types where iszero can’t be sensibly defined, like a string.


#3

Yet a version of mapreduce which checks the accumulator for a specific value and returns early upon encountering it could be useful.