Kotlin Notes - 6

To access this from an outer scope (a class, extension function, or labeled function literal with receiver) you write this@label, where @label is a label on the scope this is meant to be from:

class A { // implicit label @A
    inner class B { // implicit label @B
        fun Int.foo() { // implicit label @foo
            val a = this@A // A's this
            val b = this@B // B's this

            val c = this // foo()'s receiver, an Int
            val c1 = this@foo // foo()'s receiver, an Int

            val funLit = lambda@ fun String.() {
                val d = this // funLit's receiver, a String
            }

            val funLit2 = { s: String ->
                // foo()'s receiver, since enclosing lambda expression
                // doesn't have any receiver
                val d1 = this
            }
        }
    }
}

Destructuring declarations

val (name, age) = person

for ((a, b) in collection) { ... }

for ((key, value) in map) {
   // do something with the key and the value
}

val (_, status) = getResult()

map.mapValues { entry -> "${entry.value}!" }
map.mapValues { (key, value) -> "$value!" }