Getting started

4 lessons in the JavaScript course.

Full JavaScript course · Search this topic · Programming

• Running JavaScriptRun JavaScript in a browser console, an HTML page, and Node.js.
• Hello WorldWrite a first JavaScript program and display its output in several environments.
• Comments and ErrorsDocument intent, inspect error messages, and debug common JavaScript mistakes.
• Strict ModeEnable stricter checks and avoid error-prone legacy JavaScript behavior.