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Kotlin Collections

Kotlin Collections is a standard library component that provides a rich set of data structures and operations for handling collections of objects, such as lists, sets, and maps. It offers both mutable and immutable variants, along with functional programming-style operations like map, filter, and reduce, making data manipulation concise and expressive. The library is designed to be interoperable with Java collections while enhancing them with Kotlin's language features like null safety and extension functions.

Also known as: Kotlin Collections API, Kotlin Stdlib Collections, Kotlin Collection Framework, Kotlin Coll, Kotlin Col
🧊Why learn Kotlin Collections?

Developers should learn Kotlin Collections when building applications in Kotlin, especially for Android development, backend services, or any Kotlin-based project, as it is essential for efficient data processing and manipulation. It is particularly useful in scenarios requiring functional transformations, such as filtering lists of data, aggregating results, or handling complex data structures with ease and safety. Mastering it improves code readability, reduces boilerplate, and leverages Kotlin's modern paradigms.

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