Networking & Internet
JavaScript
Definition
JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. It is high-level, often just-in-time compiled, and multi-paradigm. It has curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions.
Why It Matters
JavaScript is the programming language of the web. It runs directly in the user's browser and is used to create dynamic, interactive user experiences, from simple animations to complex single-page applications.
Contextual Example
When you click a "Like" button on a social media site and the count instantly updates without the page reloading, that is JavaScript at work. It handled the click event, sent a request to the server in the background, and updated the page content.
Common Misunderstandings
- JavaScript has no relationship to the Java programming language; the similar name was a marketing decision.
- Node.js is a runtime environment that allows JavaScript to be run on servers, outside of a web browser.