Mastering Kotlin

Implementing the Strategy pattern in Kotlin

In our previous example of Chess, we defined concrete strategies by implementing the BotBehavior interface. This interface was quite simple and defined only a single method. In situations like these, we could simplify our Strategy pattern implementation by relying on higher-order functions instead of concrete types. Let's see how this is done:

1. Let's create a new chess class called FunctionalChess:

class FunctionalChess(val behavior: (Array<Array<Int>>) -> Unit) {    fun play() {        // game loop        // relies on behavior    }    fun pause() { }}

This new FunctionalChess class takes a function parameter instead of an instance of BotBehavior. This will enable us to define our behavior strategies as functions and ...