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Kotlins’ Collections implements interface List of Java. Public inline fun Iterable.filter(predicate: (T) -> Boolean): List How to explain the fact that ArrayList of Java is equal to List of Kotlin? val list: = () The arrayList() is function of Kotlin ArrayList class, which is used to create a new ArrayList. * Returns a list containing only elements matching the given. Learn C Learn C++ Learn C Learn R Learn Kotlin Learn Go Learn Django Learn TypeScript. For instance, if you open _Collections.kt file from stdlib you can find many methods similar to this: /** Since Java is present in the arraylist, the method returns true. Kotlin has a feature called Extension Functions which enables Kotlin Standard Library (stdlib) to extend functionality of JDK’s classes. This article focuses on some features of llections package.

ArrayList() lateinit var.

Kotlin’s Collections are based on Java Collection Framework. Build real-world Android and web applications the Kotlin way Iyanu Adelekan. null elements are unique as well: a Set can contain only one null.

Set Set stores unique elements their order is generally undefined.

Let’s look how to use collections in Kotlin together, it will be exciting! In Kotlin, the default implementation of MutableList is ArrayList which you can think of as a resizable array.

This topic is relevant for versed developers that have serious intentions to come to grips with Kotlin and to be in the forefront of the trends, of course.

If you missed this topic by some reason, we strongly recommend to take a look at this survey. Developing android app with Kotlin is gaining popularity among the Java developers.