![]() ![]() In Kotlin, there are many operations on collections that look exactly the same as their counterparts in Java. This video by Sebastian Aigner, Kotlin Developer Advocate.Īll of the examples below use Java and Kotlin standard library APIs only. The second part of the guide, starting from Mutability, explains some of the differences by looking at specific cases.įor an introduction to collections, see the Collections overview or watch It is divided into operations that are the sameĪnd operations that exist only in Kotlin. The first part of this guide contains a quick glossary of operations on the same collections in Java and Kotlin. It will help you migrate from Java to Kotlin and write your code in the authentically Kotlin way. This guide explains and compares collection concepts and operations in Java and Kotlin. Note that altering a mutable collection doesn't require it to be a var.Collections are groups of a variable number of items (possibly zero) that are significant to the problem being solved and are commonly operated on. Val numbers = mutableListOf("one", "two", "three", "four") Mutable collections provides both read and write methods. When you run the above Kotlin program, it will generate the following output: Val numbers = listOf("one", "two", "three", "four") ![]() Immutable Collection or simply calling a Collection interface provides read-only methods which means once a collection is created, we can not change it because there is no method available to change the object created. Kotlin provides the following types of collection: Keys are unique, and each of them maps to exactly one value. Kotlin Map - Map (or dictionary) is a set of key-value pairs. Kotlin Set - Set is a collection of unique elements which means a group of objects without repetitions. Elements can occur more than once in a list. Kotlin List - List is an ordered collection with access to elements by indices. The following collection types are relevant for Kotlin: The Kotlin Standard Library provides a comprehensive set of tools for managing collections. A collection usually contains a number of objects of the same type and Objects in a collection are called elements or items. Collections are a common concept for most programming languages. ![]()
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