how to perform cumProd() operation over a list?

# getting-started

[Steven Wang]

how to perform cumProd() operation over a list?

[nanodeath]

list.forEach { it.foo() }

[Shawn]

I don’t think that’s what they mean by `cumProd()`…

[Steven Wang]

hmm not sure, how it can do cumulative multiplication ?

[Shawn]

assuming you mean cumulative product, then you probably want something like this

list.runningReduce { acc, next -> acc * next }

[nanodeath]

depends also whether you want a single value at the end -- if yes, probably fold/reduce

[Shawn]

if you’re working with a numeric type, you can shorten that by providing a reference to its times method, for example with `Int`:

val cumprod = ints.runningReduce(Int::times)

[Steven Wang]

got it, thx, that's exactly I wanted.