Code Sample for Adding Maps to Maps in Kotlin Programming Language

The function’s return type is a list of lists, which contains only unique characters as ensured by the method.

kotlin map list

val numbers = setOf(1, 2, 3)
println(numbers.map { it * 3 })  // [3, 6, 9]

create a map from list kotlin

fun main() {
    val numbers = listOf("one", "two", "three", "four")
    println(numbers.associateBy { it.first().toUpperCase() })
    println(numbers.associateBy(keySelector = { it.first().toUpperCase() }, valueTransform = { it.length }))
}

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