Lambda with receiver

fun main(args : Array<String>){
    val message = buildString{
        append("Hello ")
        append("from ")
        append("lambda ")
    }
    println(message)
}

fun buildString(action: StringBuilder.() -> Unit): String{
    val stringBuilder = StringBuilder()
    stringBuilder.action()
    return stringBuilder.toString()
}

Kotlin

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Lambda with receiver

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