jashkenas/underscore

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

27329 stars · 5426 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Underscore.js is a JavaScript utility-belt library offering over 100 functional programming helpers (map, filter, reduce, debounce, etc.) without extending built-in objects. It is a mature, widely-used dependency historically tied to Backbone.js and jQuery-era development.

Use cases

• use functional helpers like map, filter, and reduce in JavaScript
• debounce or throttle event handlers in the browser
• group, sort, and index collections of objects
• deep-compare and clone objects in JavaScript
• support legacy browsers lacking modern array methods
• maintain a Backbone.js or older jQuery codebase

When to choose

• you need battle-tested functional utilities with broad legacy browser support
• you maintain an existing codebase already depending on Underscore or Backbone
• you want a tiny, dependency-free utility library with stable APIs

When to avoid

• you are starting a modern project where native ES6+ array/object methods suffice
• you need lazy evaluation or a rich collection API, where Lodash is a better fit
• you want a library under very active development

Facets

library · maturity maintenance

developer-tools web-development frontend developer-tools browser cross-platform functional-programming utility-belt javascript collections chaining backbone-dependency algorithms nodejs

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