JavaScript has three main types of loops: 1. The While Loop This is an entry-check loop. It checks the condition before it runs the code. If the condition is false at the start, the code never runs.

Arrays Arrays are the main tool in JavaScript. They use contiguous memory. This allows you to access any element by its index instantly. - push: Adds an element to the end. - unshift: Adds an element ...

Most rules target JavaScript and TypeScript, but some also lint CSS, HTML, JSON, and Markdown when used with the matching ESLint language plugin.