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so, if:
```val obj1 = MyDataObj(1,3,4)
val obj2 = MyDataObj(3,2,3)
val obj3 = MyDataObj(2,4,1)
val list = listof(obj1,obj2,obj3)```
I would like to derive `objTot`, which has a=6, b=9, c=8

<https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/fold.html>

Or `reduce` to use the first object in the list as the starting accumulator, instead of manually specifying one. <https://pl.kotl.in/JFktqNpTr>

Semantically, `reduce` is for when you are “collapsing” values into a single object of the same type as the originals. `fold` is when you’re collapsing those values into a different type, or you want to manually specify the starting state for accumulation

<https://kotlinlang.org/docs/reference/collection-aggregate.html#fold-and-reduce>