``` val input: List<List<Double>> = ...

# announcements

[arve]

val input: List<List<Double>> = 
 [[1, 2, 3 (....)],
  [4, 5, 6, (...)],
  [7, 8, 9, (...)]] 
val expected= [12, 15, 18, (...)]

Trying to find an elegant way to sum elements of a list of list of numbers by index (i.e. "downwards")🤔

[camkadev]

looks like you need function with income predicate and usage of Fold https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/fold.html