What is Kotlin delegation and how it works?

Question

I'm really confused by Kotlin delegation, can somebody provide me with a more practical example?

interface Base {
fun print()
}

class BaseImpl(val x: Int) : Base {
override fun print() { print(x) }
}

class Derived(b: Base) : Base by b

fun main() {
val b = BaseImpl(10)
Derived(b).print()
}

Answer 1

https://www.baeldung.com/kotlin/delegation-pattern

https://www.geeksforgeeks.org/delegation-in-kotlin/

https://kotlinlang.org/docs/delegation.html

Answer 2

Thank you!