kotlin-stdlib / kotlin.text / reduceRight

reduceRight

Common
JVM
JS
Native
1.0
inline fun CharSequence.reduceRight(
    operation: (Char, acc: Char) -> Char
): Char

Accumulates value starting with last character and applying operation from right to left to each character and current accumulator value.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val strings = listOf("a", "b", "c", "d")
println(strings.reduceRight { string, acc -> acc + string }) // dcba
println(strings.reduceRightIndexed { index, string, acc -> acc + string + index }) // dc2b1a0

// emptyList<Int>().reduceRight { _, _ -> 0 } //  will fail
//sampleEnd
}