a contrived example: ``` val sampleList = ...

# arrow

[tginiotis]

a contrived example:

val sampleList = listOf("one", "two", "three")
        
        val tCount = sampleList.fold(0) { acc, r ->
            acc + if (r == "t") {
                1
            } else {
                0
            }
        }
        val wCount = sampleList.fold(0) { acc, r ->
            acc + if (r == "w") {
                1
            } else {
                0
            }
        }

now I have tCount and wCount, which I got by going over the list 2 times from the beginning to the end. After one fold operation was finished - the other started. I would rather that the folds would be interleaved and a tuple2 would be the result