Q1. What is JavaScript?
JavaScript is a high-level, interpreted programming language mainly used to make web pages interactive and dynamic.
It allows developers to create features like:
Example
This code prints "Hello World" in the browser console.
It allows developers to create features like:
- Form validation
- Animations
- Dynamic content updates
- Interactive buttons and menus
console.log("Hello World");This code prints "Hello World" in the browser console.
Q2. Why is JavaScript Used in Web Development?
JavaScript is used because it adds behavior and interactivity to websites.
Uses of JavaScript:
JavaScript works together with:
Uses of JavaScript:
- Updating content without refreshing the page
- Creating interactive forms
- Building games and animations
- Communicating with servers
- Developing full-stack applications
- HTML → Structure
- CSS → Styling
- JavaScript → Functionality
Q3. Is JavaScript a Compiled or Interpreted Language?
JavaScript is an interpreted language.
This means:
Modern JavaScript engines also use Just-In-Time (JIT) compilation to improve performance.
This means:
- Code is executed line by line
- No separate compilation step is required
- It runs directly inside web browsers
Q4. Where Can JavaScript Run?
JavaScript can run in multiple environments:
1. Web Browsers
Used for frontend development.
2. Servers
Used with runtime environments to build backend applications.
3. Mobile and Desktop Applications
Used in cross-platform development.
Used for frontend development.
2. Servers
Used with runtime environments to build backend applications.
3. Mobile and Desktop Applications
Used in cross-platform development.
Q5. What Are the Features of JavaScript?
These features make JavaScript flexible and powerful.
- Lightweight and fast
- Object-oriented
- Event-driven
- Platform independent
- Supports functional programming
- Asynchronous programming support