Question 1

Is Underscore.js still relevant in modern JavaScript development?

Accepted Answer

Yes, but primarily for legacy projects or where cross-environment consistency is crucial. For new code, native ES6+ methods or Lodash are often preferred due to better performance and features.

Question 2

How do I chain functions in Underscore?

Accepted Answer

Use _.chain() to wrap a collection, call methods like map() or filter(), and end with .value() to retrieve the result. Example: _.chain(array).map(x => x*2).filter(x => x > 10).value().

Question 3

Underscore vs Lodash: which is better for a new project?

Accepted Answer

Lodash is generally better as it's a superset of Underscore with more functions, better performance, and active development. Underscore is lighter but less feature-rich and updated.

Question 4

Can I use Underscore with TypeScript?

Accepted Answer

Yes, TypeScript definitions are available via npm, but they may not be as comprehensive or up-to-date as those for newer libraries. Check compatibility with your TypeScript version.

Question 5

What are the most useful Underscore functions for working with objects?

Accepted Answer

Functions like _.keys(), _.values(), _.pick(), and _.omit() are handy for object manipulation. They provide consistent ways to extract or filter properties across environments.

Question 6

How to install Underscore in a Node.js project?

Accepted Answer

Run 'npm install underscore' to add it, then require it with const _ = require('underscore');. For ES modules, use import _ from 'underscore'; if your setup supports it.

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