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Kotlin Collections

Collections in Kotlin are used to store group of related objects in a single unit. By using collection, we can store, retrieve manipulate and aggregate data.

Types of Kotlin Collections

Kotlin collections are broadly categories into two different forms. These are:

  1. Immutable Collection (or Collection)
  2. Mutable Collection

Immutable Collection:

Immutable collection also called Collection supports read only functionalities. Methods of immutable collection that supports read functionalities are:

Collection Types Methods of Immutable Collection
List listOf()
listOf<T>()
Map mapOf()
Set setOf()

Mutable Collection:

Mutable collections supports both read and write functionalities. Methods of mutable collections that supports read and write functionalities are:

Collection Types Methods of Mutable Collection
List ArrayList<T>()
arrayListOf()
mutableListOf()
Map HashMap
hashMapOf()
mutableMapOf()
Set hashSetOf()
mutableSetOf()

Next TopicList: listOf()




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