Now, you will understand the types of Kotlin Delegation. The derived class can access all the implemented public methods of an interface through a particular object using Kotlin's delegation or keyword techniques. Kotlin has added a new keyword called 'by' to support the 'delegation' design pattern. Each design pattern has its own logic, which helps simplify the code. Like Java and other languages, the Kotlin language features a large number of design patterns. Now, you will understand how Kotlin Delegation works in web development. The by keyword is used from DerivedClass to access the run() function, which is implemented in BaseClass. In the above example, Boss is the name of the interfaces, and run() is its abstract function.

The by keyword in Kotlin is used to achieve this. They are applicable to both static and dynamic relationships between classes and functions once they have been implemented.ĭelegation techniques allow for changing how inheritance is implemented in classes and functions, and object-oriented programming languages naturally support this without the need for boilerplate code. Two objects under Delegation deal with a request: a receiving object delegates tasks to its delegate, who then handles the request.ĭelegation governs the transfer of authority or power from one object to another. Making a composition as powerful for reuse as inheritance is possible with Delegation.

Kotlin by lazy with parameter