JavaScript is a high-level, interpreted programming language primarily used to add interactivity and dynamic behavior to websites. It is one of the core technologies of the web, alongside HTML and CSS, and is supported by all modern browsers.
Key Features
Dynamic Typing
Variables in JavaScript are not bound to a specific type. Types are determined at runtime.
Prototype-Based
JavaScript uses prototype-based inheritance instead of classical inheritance models.
First-Class Functions
Functions are treated as first-class citizens, meaning they can be:
- Assigned to variables
- Passed as arguments
- Returned from other functions
Event-Driven
JavaScript supports event-driven programming, making it suitable for interactive UIs and real-time applications.
Asynchronous Programming
Features like callbacks, promises, and async/await allow JavaScript to handle asynchronous tasks such as API calls and timers.
Use Cases
- Building interactive web applications
- Backend development with environments like Node.js
- Mobile development using frameworks like React Native
- Desktop applications with frameworks like Electron
Purpose
JavaScript enables developers to create interactive, dynamic, and responsive applications for the web and beyond, serving as a versatile language for both frontend and backend development.