Immutablejs
Immutable.js is a JavaScript library that provides persistent immutable data structures. It offers a collection of immutable types, including Map, List, Set, OrderedMap, Record, Seq and Range, which mirror their mutable equivalents but cannot be altered once created. Operations on Immutable collections return new collections rather than mutating existing ones. Structural sharing ensures that unchanged parts of the data are reused, making updates relatively efficient for large structures.
Immutable.js emphasizes predictable state handling and functional programming patterns. Key features include path-based access and updates
Values can be converted to plain JavaScript via toJS(), and Immutable objects can be serialized or interpolated
Common use cases include managing application state in React or Redux apps, where immutability helps with change
Immutable.js is an open-source project maintained on npm and widely adopted in JavaScript ecosystems.