zipWithNext

fun CharSequence.zipWithNext(): List<Pair<Char, Char>> (source)

Platform and version requirements: Kotlin 1.2

Returns a list of pairs of each two adjacent characters in this char sequence.

The returned list is empty if this char sequence contains less than two characters.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val letters = ('a'..'f').toList()
val pairs = letters.zipWithNext()

println(letters) // [a, b, c, d, e, f]
println(pairs) // [(a, b), (b, c), (c, d), (d, e), (e, f)]
//sampleEnd
}
inline fun <R> CharSequence.zipWithNext(
    transform: (a: Char, b: Char) -> R
): List<R>
(source)

Platform and version requirements: Kotlin 1.2

Returns a list containing the results of applying the given transform function to an each pair of two adjacent characters in this char sequence.

The returned list is empty if this char sequence contains less than two characters.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val values = listOf(1, 4, 9, 16, 25, 36)
val deltas = values.zipWithNext { a, b -> b - a }

println(deltas) // [3, 5, 7, 9, 11]
//sampleEnd
}