Product of a List or Array in Kotlin

Question

I'm trying to find a way to get the product of a List or Array without using "repeat" or any loop on Kotlin but after some research I couldn't find anything similar.

Something like this in Python would be:

>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
output: 720

Answer 1

An even simpler solution might be: (1..6).reduce(Int::times)

Answer 2

You can use reduce in Kotlin.

From the doc:

Accumulates value starting with the first element and applying operation from left to right to current accumulator value and each element.

val list = listOf<Int>(1, 2, 3, 4, 5, 6)

val array = intArrayOf(1, 2, 3, 4, 5, 6)

list.reduce { acc, i ->  acc * i }  // returns 720

array.reduce { acc, i -> acc * i }  // returns 720