Immutable.js vs Ramda
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
JavaScript libraries for immutable data collections that never change once created.
Open source · MIT
A JavaScript utility library for writing functional-style code without changing your data.
The short answer
Choose Immutable.js if you need…
- JavaScript developers managing application state that is updated often
- Teams building React or Flux-style apps where data flows one way
- Developers who want cheap equality checks and memoization based on data changes
- TypeScript users who want type definitions included with the package
Choose Ramda if you need…
- JavaScript developers who want to write functional-style data transformations
- Teams that prefer immutable data handling and small composable functions
- Developers building function pipelines from simpler functions
- Projects that can install an npm package and use modern JavaScript modules
Side-by-side
| Immutable.js | Ramda | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 33k | 24.1k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | TypeScript | JavaScript |
| Last code update | 5 days ago | 25 days ago |
What each one is
Immutable.js
Immutable.js is a JavaScript library that provides data structures such as List, Map, Set and Record that cannot be changed after creation. Instead of modifying data in place, operations return new updated versions, which makes application state easier to track. It is used to make code simpler and to help detect changes efficiently.
Ramda
Ramda is a JavaScript library of helper functions for transforming data in a functional style. Its functions are automatically curried and take the data as the last argument, so you can chain small functions into pipelines. It is designed so that it never mutates the data you pass in.
Best for
Immutable.js
- JavaScript developers managing application state that is updated often
- Teams building React or Flux-style apps where data flows one way
- Developers who want cheap equality checks and memoization based on data changes
- TypeScript users who want type definitions included with the package
Ramda
- JavaScript developers who want to write functional-style data transformations
- Teams that prefer immutable data handling and small composable functions
- Developers building function pipelines from simpler functions
- Projects that can install an npm package and use modern JavaScript modules
Strengths
Immutable.js
- Has no dependencies, according to the README
- Includes type definitions for Flow and TypeScript when installed via npm
- Uses structural sharing so updates reuse most of the existing data structure
Ramda
- Functions are automatically curried, which makes building new functions from old ones straightforward
- Data is supplied last in arguments, which the README says supports pipeline-style code
- Published as an npm package with browser, Deno and ES module builds
Not ideal for
Immutable.js
- Projects that only need simple data and do not care about accidental mutation, since the library adds an API to learn
- Developers who need native JavaScript arrays and objects to interoperate directly without conversion, since Immutable collections are a different type
- Beginners new to JavaScript who should first learn plain objects and arrays
Ramda
- Developers who want a general-purpose toolkit mixing paradigms; the README says Ramda is focused on functional style specifically
- Beginners who are not yet comfortable with functions as values, since currying and composition take practice to read
- Projects that need the library to enforce immutability; the README says Ramda does not enforce it
Trade-offs
Immutable.js
- Requires learning a new API and treating collections as values rather than objects
- TypeScript type definitions need ES2015 lib or target settings, per the README
- Converting between Immutable collections and plain JavaScript data adds work at boundaries
Ramda
- Functional style with currying can be harder to read for developers new to the approach
- The README notes that using the 'latest' CDN link risks breaking changes, so versions should be pinned
- Tree-shaking results depend on the bundler and setup, according to the README
Getting started
Immutable.js
Install using npm
npm install immutableInstall using Yarn
yarn add immutableFrequently asked questions
What is the difference between Immutable.js and Ramda?
Immutable.js: JavaScript libraries for immutable data collections that never change once created. Ramda: A JavaScript utility library for writing functional-style code without changing your data. Immutable.js suits javascript developers managing application state that is updated often, while Ramda suits javascript developers who want to write functional-style data transformations.
Are Immutable.js and Ramda free?
Immutable.js: Free and open source. Ramda: Free and open source.
Is Immutable.js or Ramda more popular?
Immutable.js has more GitHub stars (33k) than Ramda (24.1k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to Immutable.js and Ramda?
Other options people compare them with include Immer.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.