Underscore.js
Is Underscore.js a front-end or back-end JavaScript library?
Answer:
Underscore.js is a JavaScript utility library functioning in both browser (front-end) and Node.js (back-end) environments. It offers functional programming helpers-map, filter, reduce, debounce, throttle-that were vital before ES6+ native array methods rendered most of its features redundant. By 2026, Underscore.js has been largely replaced by native JavaScript ES6+ methods and Lodash. It only remains actively used in legacy codebases.
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