Property delegation is one option, but you can also just treat it as a regular object. MutableStateOf supports a variety of ways to interact with it. When you use the object on the right side of the by in code like above, the getFoo and setFoo methods call (delegate to) the delegate's getter and setter, respectively.ĭelegated properties can be both class properties and local properties (i.e. In the above code, the compiler generates fun getFoo(): T and fun setFoo(value: T).Ī property delegate is an object that has special getter and setter methods (or extension functions). Remember that a property in Kotlin is effectively just a pair of getter and setter methods. It's been a core feature of the language for… ever, I think. Here I’ve extended the iterator interface and implemented two of the required methods.Enter fullscreen mode Exit fullscreen mode MutableIterator extends the iterator and also provides the remove () method: public abstract fun remove(): kotlin.Unit The iterator has the hasNext () and next () methods public abstract operator fun hasNext(): kotlin.Boolean MutableIterable extends Iterable and provides the MutableIterator for mutable collections. It provides the iterator that gives you the possibility to iterate your collection. The first interface in the collections hierarchy is Iterable. Here is a general scheme of a Kotlin collection framework:Īs you can see, the immutability principle was implemented, which means that you cannot perform modifications on collections. Let’s look at what Kotlin collections actually are. Of course, you still have Java to Kotlin compatibility, so all Java collections are available for Kotlin applications as well.

It’s the developer’s task to choose the right implementation for the given purpose. At the same time, we have a lot of different collection interface implementations. Java collections are quite straightforward and an easy component for simple use cases. Software Engineer Android use collection every day in Java/Android development for different purposes: modifying data collections and displaying a UI with a list of items as well as business logic-related processes.

Mutable list kotlin