Part 14 – When – Coding in Flow

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In part 14 of the Kotlin beginner tutorial, we will learn how to use the when expression as a more readable replacement for complex if-else-if ladders.

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KotlinTutorial.kt

fun main() {
    val time = 14
    val isSunday = true

    val greeting = when {
        isSunday -> "I'm gonna stay in bed all day!"
        time < 5 -> "Why up so early?"
        in 0..11 -> "Good morning!"
        12 -> "Time for lunch!"
        13, 14 -> {
            println("Yawn...")
            "Time for a nap!"
        }
        else -> "Good day!"
    }

    println(greeting)
}