However, Kotlin enables users to create changeable maps, or maps that can be changed after they’ve been created. This implies that once an element in Map is generated, it cannot be edited, removed, or updated. Maps in Kotlin are immutable by default as part of the collections framework. Map is also known as dictionaries or associative arrays in other programming languages. The mutable types are extremely useful where the data needs to be manipulated frequently, as per the requirements a good example of this can be API call results shown in the form of a list with filters or search queries. Keys are unique, and each of them maps to exactly one valueĪpart from this, Kotlin also has mutable variants of the collection: MutableList, MutableSet, and MutableMap, which allows you to modify the collection, such as adding or removing elements. Kotlin Set: A collection of unique elements which means a group of objects without repetitions.(Note: Elements can occur more than once in a list) Kotlin List: An ordered collection with access to elements by indices.The following collection types are relevant for Kotlin: Kotlin collections are categorized into two types: Instead of modifying the contents of a collection, you need to build a new collection with the modifications applied, which you can then securely move around in your application while the old collection stays unaltered. The Kotlin Standard Library provides a comprehensive set of tools for managing collections.Ĭollections are read-only by default in Kotlin. In this article, you will learn about the Map interface in Kotlin as well as its usage and association with coding examples.īy making use of collections, you can store, update, retrieve, and aggregate data points. Collections are used extensively in most programming languages, and they are made up of pieces or items that are all of the same sort.Īn understanding of the Kotlin collections framework and how to use it effectively in the development of apps will help you get a grip of this programming language and its capabilities. Kotlin has a comprehensive set of tools for managing collections. If you’re interested in Android app development or Kotlin multiplatform development, you may have come across the collections framework in Kotlin. A guide to using the Map interface in Kotlin Co-host of the NinjaTalks podcast and community organizer at Google Developers Group. Sneh Pandya Follow Exploring the horizon with a knack for product management.
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