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What is "out" keyword in Kotlin?
"Out" keyword is extensively used in Kotlin generics. Its signature looks like this −
List<out T>
When a type parameter T of a class C is declared out, then C
Example
The following example demonstrates how you can use the "out" keyword in Kotlin −
fun main(args: Array<String>) {
var objet1 = genericsExample<Int>(10)
var objet2 = genericsExample<Double>(10.0)
}
// As generic type is declared as "out",
// we can pass Int and Double also.
class genericsExample<out T>(input:Any?) {
init {
println("I am getting called with the value "+input)
}
}Output
It will produce the following output
I am getting called with the value 10 I am getting called with the value 10.0
Updated on: 23-Nov-2021
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