What is Vararg in Kotlin?

Kotlin Android. Sometimes we need a function where we can pass n number of parameters, and the value of n can be decided at runtime. Kotlin provides us to achieve the same by defining a parameter of a function as vararg .

Here, () -> Unit is a function type and the Unit after the -> indicates that this function type does not return any meaningful value . Mentioning the Unit cannot be skipped in function types. Unit for Extending Generics. Every function has to return a value.2 May 2019

In Kotlin, the “this” keyword allows us to refer to the instance of a class whose function we happen to be running .

From the Kotlin documentation: If a function does not return any useful value, its return type is Unit. Unit is a type with only one value — Unit.VALUE.