Learning JavaScript fundamentals and setup

What JavaScript is and what it enables

JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive, enabling features like animations, clickable controls, and popup menus. It runs inside a host environment (most commonly a web browser) where it can connect to objects such as the Document Object Model (DOM) to control page behavior and respond to user events. Beyond the browser, JavaScript can also be used on the server through technologies such as Node.js, allowing websites to do more than serve static files—for example, handling realtime collaboration and responding to custom requests from code running in the browser. JavaScript includes a standard library (e.g., Array, Map, Math) and core language elements (operators, control structures, statements), and it can be extended with environment-specific objects for client-side (browser/DOM control) and server-side (database communication, persistence, and file manipulation) capabilities.

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Client-side JavaScript and browser DOM control

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