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December 19, 2019 15:33
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mapAccumLeft written in Kotlin
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| fun <E1, E2, R> mapAccumLeft(list: List<E1>, zero: R, accumulateAndMap: (R, E1) -> Pair<R, E2>): Pair<R, List<E2>> { | |
| return list.fold(Pair(zero, mutableListOf<E2>())) { | |
| (acc, mappedList), elem1 -> | |
| val (newAcc, elem2) = accumulateAndMap(acc, elem1) | |
| Pair(newAcc, mappedList.also { it.add(elem2) }) | |
| } | |
| } | |
| // sample usage | |
| mapAccumLeft(listOf(1, 2, 3, 4), "A", { str, num -> Pair(str + num, num * 10) }) |
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