NPM packages

 NPM packages: NPM (Node Package Manager) is a package manager for Node.js that allows you to easily install and manage packages for your Node.js applications. There are thousands of packages available on NPM that can help you with everything from building web applications to working with databases. Here's an example of how to install and use the popular lodash library:

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const _ = require('lodash');

const array = [1, 2, 3, 4, 5];

const sum = _.sum(array);

console.log(sum);