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OWASP 2025 Top 10 Adds Software Supply Chain Failures, Ranked Top Community Concern
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Underscore.js is a utility-belt library for JavaScript that provides support for the usual functional suspects (each, map, reduce, filter...) without extending any core JavaScript objects.
For Docs, License, Tests, and pre-packed downloads, see: https://underscorejs.org
For support and questions, please consult our security policy, the gitter channel or stackoverflow
Underscore is an open-sourced component of DocumentCloud: https://github.com/documentcloud
Many thanks to our contributors: https://github.com/jashkenas/underscore/contributors
You can support the project by donating on Patreon. Enterprise coverage is available as part of the Tidelift Subscription.
This project adheres to a code of conduct. By participating, you are expected to uphold this code.
Lodash is a modern JavaScript utility library delivering modularity, performance, & extras. It is often considered as a drop-in replacement for Underscore with additional features and improved performance.
Ramda is a practical functional library for JavaScript programmers. It emphasizes a purer functional style, immutability, and function composition, making it quite different from Underscore in terms of API design and usage patterns.
Lazy.js is a functional utility library similar to Underscore and Lodash, but with a focus on lazy evaluation, which can lead to significant performance improvements for certain types of operations on large datasets.
FAQs
JavaScript's functional programming helper library.
The npm package underscore receives a total of 14,466,269 weekly downloads. As such, underscore popularity was classified as popular.
We found that underscore demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

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