Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

More Effective Lambdas

Take another look at your Narrator.kt file:

    val narrationModifier = { message: String ->
        val numExclamationPoints = 3
        message.uppercase() + "!".repeat(numExclamationPoints)
    }

    fun narrate(
        message: String
    ) {
        println(narrationModifier(message))
    }

Eagle-eyed readers may have noticed a disappointing reality: Everything that you have done so far could have been accomplished without using lambdas. This same logic could have been expressed with a single non-anonymous function, like this:

    fun narrate(
        message: String
    ) {
        val numExclamationPoints = 3
        println(message.uppercase() + "!".repeat(numExclamationPoints))
    }

Fear not: The work you have done so far has not been in vain. Lambdas shine when you need to change ...