Why does

combine(flows, transform)

not call

transform

if

flows

is empty? Is that intended? Seems like it would be more natural to call it with an empty array.

I don't think so. the transform should only be called when there are emissions, and there are none here

My use-case is that I have a list of flows of

Int

, and I need to return a flow of their sum.

combine(List(n) { flowOf(*Array(m) { 0 }) }, transform)

the way I see it: in general, this can call

transform

anywhere in

n..n*(m-1)+1

times. when

n=0

, 0 times is a reasonable ourcome

On the other hand

combine(List(n){ flowOf(0) }, transform)

calls transform exactly once for every value of

n

except

0

combine(List(n){ flowOf(0) }, transform)

also receives emitted most recent values (which is what it operates on) for every

n

except

0

.

combine(List(n) { flowOf() }, transform)

calls

transform

0 times for any value of

n

, including 0