Unit returning functions are similar to void functions in Java. If a Function do not return any value, its return type is Unit.
UnitDemo.kt
fun welcome(name: String) : Unit {
println("Welcome $name")
return Unit // You can simply call return
}
fun main(args: Array) {
var returnValue = welcome("Hari krishna")
println("Returned value is $returnValue")
}
Output
Welcome Hari krishna
Returned value is kotlin.Unit
Specifying the type ‘Unit’ and returning Unit from unit functions is optional.
UnitDemo.kt
fun welcome(name: String) {
println("Welcome $name")
}
fun main(args: Array) {
var returnValue = welcome("Hari krishna")
println("Returned value is $returnValue")
}
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