Welcome to part 2 of my series on Kotlin. If you haven’t already, make sure you go back and read Why Kotlin is Dope: Part 1.

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Extensions

Extensions in Kotlin are a way to extend a class with new functionality. The most basic example of this is when we used to create a BaseActivity class in Java and have all the other activities in our project use inheritance MainActivity extends BaseActivity. I find Kotlin extensions to be much cleaner. How I do it is I create an extensions package in my code and create Kotlin files as so: ActivityExtensions.kt, FragmentExtensions.kt, and so on.