JavaScript library to efficiently mutate data without changing the original source

• immutability-helper

  11 5,165 0.0 TypeScript

  mutate a copy of data without changing the original source

• ramda

  80 23,578 6.6 JavaScript

  :ram: Practical functional Javascript

  

if you want to write immutable code https://ramdajs.com/ is a great library

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• immutable-js

  38 32,863 7.0 TypeScript

  Immutable persistent data collections for Javascript which increase efficiency and simplicity.

  

However, the way Immer uses that phrase seems to be different than how Immutable.js uses that phrase: https://immutable-js.github.io/immutable-js/ , https://medium.com/@dtinth/immutable-js-persistent-data-structures-and-structural-sharing-6d163fbd73d2. It specifically points to the use of specialized data structures like "hash mapped tries" as a mechanism to reuse existing references. Immer definitely doesn't use any of those.

• Immer

  141 26,943 7.1 JavaScript

  Create the next immutable state by mutating the current one

  

Yes, Immer's docs say it uses "structural sharing": https://immerjs.github.io/immer/ . Specifically, it just leaves existing references as-is if they don't need to be updated.

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