delegated_properties.kt

class GetTopics {
    // getter method
    operator fun getValue(thisRef: Any?, property: KProperty<*>): Array<Topic> {
        //Here we can change implementation
        return Array(20, { Topic("Some topic", "Some description")} )
    }
}

class MainActivity : AppCompatActivity() {
  val topics: Array<Topic> by GetTopics()//delegated properties
  ...
    
}