List, Set, Map vs mutableList, mutableSet, mutableMap - what are they?
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Kotlin Collections are a set of classes and interfaces in the Kotlin programming language that facilitate the manipulation and handling of collections of elements, such as lists, sets, and maps. These collections are part of the Kotlin standard library and offer a more concise and expressive syntax compared to Java for common operations on data structures.
Key features of Kotlin Collections include:
1. *Immutability:* Kotlin encourages the use of immutable collections, which cannot be modified after creation. This helps in preventing unintended side effects and makes the code more predictable.
2. *Mutable and Immutable Collections:* Kotlin provides both mutable and immutable versions of collections. Immutable collections are denoted by names like `List`, `Set`, or `Map`, while mutable counterparts are prefixed with `MutableList`, `MutableSet`, and `MutableMap`.
3. *Common Collection Types:*
*List:* Represents an ordered collection of elements. Elements can be accessed by their index.
*Set:* Represents an unordered collection of unique elements. Duplicate elements are not allowed.
*Map:* Represents a collection of key-value pairs, where each key must be unique.
4. *Collection Functions:* Kotlin Collections offer a range of extension functions that simplify common operations such as filtering, mapping, sorting, etc., following a functional programming style.
5. *Extension Functions:* Kotlin employs extension functions to add new functionalities to existing classes without modifying their code. Many collection operations are implemented as extension functions.
In summary, Kotlin Collections provide a robust and concise way to work with data structures, promoting immutability and functional programming principles for efficient and readable code.