Mastering Kotlin Essentials/

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Named Parameter and Default Arguments

Named Parameter and Default Arguments

Understand function parameter flexibility and clarity with named arguments.

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When we declare functions, we often specify optional parameters. A good example is joinToString, which transforms an iterable into a String. We can use it without any arguments, or we can also change its behavior with concrete arguments.

Kotlin 1.5
fun main() {
    val list = listOf(1, 2, 3, 4)
    println(list.joinToString()) // 1, 2, 3, 4
    println(list.joinToString(separator = "-")) //  1-2-3-4
    println(list.joinToString(limit = 2)) //  1, 2, ...
}

Default values for parameters

Many more functions in Kotlin use optional parametrization, but how is this ...