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Immutable Js

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Updated: 15 Dec 2025
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Immutable persistent data collections for Javascript which increase efficiency and simplicity.

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Overview

Immutable.js is a powerful library for managing immutable collections in JavaScript, providing developers with a robust API to handle persistent data structures. By ensuring that data cannot be altered once created, it simplifies application development while enhancing performance through advanced memoization and change detection techniques. This library supports a variety of data structures like Lists, Maps, and Sets, which are optimized for modern JavaScript engines, making it an essential tool for developers looking to streamline their applications and improve efficiency.

The library stands out due to its focus on immutability—lessening the need for defensive copying and making complex state management easier to handle. With features designed for both simplicity and performance, Immutable.js can greatly enhance your workflow whether you’re building large-scale applications or refining smaller projects.

Features

  • Persistent Data Structures: Immutable.js provides various data structures, including List, Stack, Map, OrderedMap, Set, and Record, ensuring efficient data management without in-place modifications.

  • Performance Optimized: Utilizes advanced structural sharing techniques to minimize memory usage and improve performance, especially in modern JavaScript VMs.

  • Lazy Sequences: Offers a lazy Seq to allow efficient chaining of methods like map and filter, reducing the need for intermediate representations and thus enhancing performance.

  • JavaScript-First API: Designed with JavaScript developers in mind, Immutable.js is easy to integrate into existing projects, ensuring a smooth learning curve for those familiar with JavaScript collections.

  • TypeScript and Flow Support: Provides built-in type definitions for TypeScript and Flow, enhancing development with features like error detection and auto-complete in IDEs.

  • No External Dependencies: Immutable.js can be included in browser environments without any additional libraries, simplifying the integration process for web applications.

  • Easy Installation: Can be installed via npm with minimal setup, or simply included in a project using a script tag for quick access.