Koloboke - Java Collections till the last breadcrumb of memory and performance

•    Java

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Koloboke aims to replace the standard Java collections and streams with more efficient implementations. The current version of Koloboke focuses on replacing java.util.HashSet and java.util.HashMap. It provides a complete set of primitive type implementations for each collection. Its able to avoid the expensive boxing/unboxing of primitives and saves memory for boxed primitive objects. It is the fastest and the most memory efficient library implementing hash maps and sets.

collections java-collection collections-library hashmap set list map

HPPC - High Performance Primitive Collections for Java

•    Java

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HPPC provides template-generated implementations of typical collections, such as lists, sets and maps, for all Java primitive types. The primary driving force behind HPPC is optimization for highest performance and memory efficiency.

collections java-collection collections-library hashmap set list map

Redisson - Redis based In-Memory Data Grid for Java

•    Java

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Redisson - distributed Java objects and services (Set, Multimap, SortedSet, Map, List, Queue, BlockingQueue, Deque, BlockingDeque, Semaphore, Lock, AtomicLong, Map Reduce, Publish / Subscribe, Bloom filter, Spring Cache, Executor service, Tomcat Session Manager, Scheduler service, JCache API) on top of Redis server. Rich Redis client.

cache distributed-caching distributed-locks redis-client redis-cluster collections java-collections hashmap set queue

Capsule - The Capsule Hash Trie Collections Library

•    Java

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Capsule aims to become a full-fledged (immutable) collections library for Java 8+ that is solely built around persistent tries. The library is designed for standalone use and for being embedded in domain-specific languages. Capsule still has to undergo some incubation before it can ship as a well-rounded collection library. Nevertheless, the code is stable and performance is solid.

hashmap trie immutable immutable-collections persistent-data-structure hashset performance data-structure collections map list champ

Eclipse Collections - Best Java Collection Framework

•    Java

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Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API, additional types not found in the JDK like Bags, Multimaps, and set of utility classes that work with any JDK compatible Collections, Arrays, Maps, or Strings. The iteration protocol was inspired by the Smalltalk collection framework. It maximizes the power of Java 8 Lambda expressions and method references with rich APIs directly available on your collections.

collections java-collection collections-library utility data-structure

Apache Commons - Alternative to Java collection

•    Java

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Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities. It provides collection class like Identity map, Ordered map, Reference map, Composite collections, Bag interface etc.

java-collection library map utility

immutable - Immutable collections for Go

•    Go

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This repository contains immutable collection types for Go. It includes List, Map, and SortedMap implementations. Immutable collections can provide efficient, lock free sharing of data by requiring that edits to the collections return new collections. The collection types in this library are meant to mimic Go built-in collections such asslice and map. The primary usage difference between Go collections and immutable collections is that immutable collections always return a new collection on mutation so you will need to save the new reference.

immutable collections

gs-collections-kata - The GS Collections Kata has been migrated to the Eclipse Foundation, re-branded as the Eclipse Collections Kata

•    Java

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A kata is an exercise in martial arts. A code kata is an exercise in programming which helps hone your skills through practice and repetition. You can find out more about code Katas in general here.The GS Collections Kata is a fun way to help you learn idiomatic GS Collections usage. This particular kata is set up as a series of unit tests which fail. Your task is to make them pass, using GS Collections. The Kata is meant to take approximately one eight-hour day.

Essentials - General purpose utilities and hash functions for Android and Java (aka java-common)

•    Java

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Essentials are a collection of general-purpose classes we found useful in many occasions. This project is bare bones compared to a rich menu offered by Guava or Apache Commons. Essentials is not a framework, it's rather a small set of utilities to make Java standard approaches more convenient or more efficient.

collections java-collections hash-map murmur3 utility library

bifurcan - impure functional data structures

•    Java

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This library provides high-quality Java implementations of mutable and immutable data structures, each sharing a common API. Rather than using the existing collection interfaces in java.util such as List or Map, it provides its own interfaces (IList, IMap, ISet) that provide functional semantics - each update to a collection returns a reference to a new collection.

data-structure collections immutable map list java-collections

Buckets-JS - A complete, fully tested and documented data structure library written in pure JavaScript

•    Javascript

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Buckets is a complete, fully tested and documented data structure library written in pure JavaScript.

data-structures collections collection linked-list dictionary map multimap stack queue set bag binary-heap priority-queue binary-search binary-search-tree tree tree-structure buckets data structure linked list heap priority binary data-structure hashmap

Boon - Low Ceremony. High Productivity. A real boon to Java to developers!

•    Java

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The main goal of Boon is to reduce the productivity delta between Java and Python/Groovy/Ruby. The idea is to just create a lower ceremony APIs. Less Java like APIs, and more getting things done quickly APIs. If reading a file takes one line of code in Ruby/Python/Groovy, then it will also in Java. If slice notation is part of those language, then Boon will have it to.

java-collections data-structure utility json-parser collections

Paguro - Immutable Collections and Functional Transformations for the JVM

•    Java

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Immutable Clojure collections and a Transformation abstraction for Java 8+, immutably, type-safely, and with good performance. It provide support for RRB Tree, which is an immutable List (like Clojure's PersistentVector) that also supports random inserts, deletes, and can be split and joined back together in logarithmic time.

immutable-collections rbtree kotlin jvm transformations stream data-structure collections immutable map list java-collections

Trove - High performance collections for Java

•    Java

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Trove provides fast, lightweight implementations of the java.util Collections API. These implementations are designed to be pluggable replacements for their JDK equivalents. This gap in the JDK is often addressed by using the "wrapper" classes (java.lang.Integer, java.lang.Float, etc.) with Object-based collections. For most applications, however, collections which store primitives directly will require less space and yield significant performance gains.

java-collection library map utility

collections - This package contains JavaScript implementations of common data structures with idiomatic interfaces

•    Javascript

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This package contains JavaScript implementations of common data structures with idiomatic iterfaces, including extensions for Array and Object. You can use these Node Packaged Modules with Node.js, Browserify, Mr, or any compatible CommonJS module loader. Using a module loader or bundler when using Collections in web browsers has the advantage of only incorporating the modules you need. However, you can just embed <script src="collections/collections.min.js"> and all of the collections will be introduced as globals. ⚠️ require("collections") is not supported.

collections data-structures observable list set map splay

Agrona - Library to build high-performance applications in Java and C++

•    Java

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Agrona provides a library of data structures and utility methods that are a common need when building high-performance applications in Java and C++. It supports Buffers, Map, Sets, Cache, Queues and lot more.

collections java-collection collections-library utility data-structure

SmoothieMap - A gulp of low latency Java HashMap

•    Java

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SmoothieMap is a Map implementation for Java with the lowest memory usage and absence of rehash latency spikes. Under the hood, it is a version of extendible hashing with 48-slot mini segments. This project also includes a proof-of-concept implementation of SwissTable algorithm in Java.

java-collections hashmap collections openhft low-latency

Koloboke - Java Collections till the last breadcrumb of memory and performance

•    Java

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A family of projects around collections in Java (so far). A carefully designed extension of the Java Collections Framework with primitive specializations and more. Java 6+. Apache 2.0 license.

java-collections koloboke annotation-processor primitive-specializations high-performance hashmap collections

Immutable.js - Immutable collections for JavaScript

•    Javascript

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Immutable data cannot be changed once created, leading to much simpler application development, no defensive copying, and enabling advanced memoization and change detection techniques with simple logic. Persistent data presents a mutative API which does not update the data in-place, but instead always yields new updated data. Immutable.js provides many Persistent Immutable data structures including: List, Stack, Map, OrderedMap, Set, OrderedSet and Record.

immutable persistent lazy data data-structure functional collection stateless sequence iteration collections

Vavr - Object-functional language extension to Java

•    Java

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Vavr is an object-functional language extension to Java 8, which aims to reduce the lines of code and increase code quality. It provides persistent collections, functional abstractions for error handling, concurrent programming, pattern matching and much more.

javaslang java8 functional-programming object-functional immutable-collections persistent-collections vavr functional streams collections java-collections