Collections

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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

This library makes some new Scala APIs (mainly collections) available to older versions of Scala.

Standalone efficient collections.

fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, ...

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

Kotlin Immutable Collections multiplatform library

High Performance Primitive Collections: data structures (maps, sets, lists, stacks, queues) generated for combinations of object and primitive types to conserve JVM memory and speed up execution.

scala-parallel-collections

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. It is a fast, scalable and easy to use embedded Java database.

Types that extend and augment the Java Collections Framework.