Lambdas and Higher-Order Functions

Trailing Lambda

Move the final lambda argument outside the parentheses.

Trailing Lambda

TrailingLambda.kt 
fun buildSteps(count: Int, label: (Int) -> String): String {
    var text = ""

    for (index in 1..count) {
        if (text != "") {
            text += ","
        }
        text += label(index)
    }

    return text
}

fun main() {
    val count = 
    val steps = buildSteps(count) { index ->
        "step$index"
    }

    println("count=$count")
    println("steps=$steps")
}

fun buildSteps(count: Int, label: (Int) -> String): String {
    var text = ""

    for (index in 1..count) {
        if (text != "") {
            text += ","
        }
        text += label(index)
    }

    return text
}

fun main() {
    val count = 
    val steps = buildSteps(count) { index ->
        "step$index"
    }

    println("count=$count")
    println("steps=$steps")
}

fun buildSteps(count: Int, label: (Int) -> String): String {
    var text = ""

    for (index in 1..count) {
        if (text != "") {
            text += ","
        }
        text += label(index)
    }

    return text
}

fun main() {
    val count = 
    val steps = buildSteps(count) { index ->
        "step$index"
    }

    println("count=$count")
    println("steps=$steps")
}
trailing-lambda When a lambda is the last argument, Kotlin can place it after the call.