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Setting Up Your Development Environment
Visual Studio Code (free) is the most common editor for JavaScript, with excellent built-in support — no extension strictly required to get started, though "Prettier" (code formatting) is a popular first addition.
For browser-based JavaScript, you also need your browser's built-in
developer tools (open with F12 or Cmd+Option+I) — the "Console" tab is
where console.log() output appears.