JavaScript Basics

Introduction to JavaScript

JavaScript is a programming language used to add interactivity to web pages. It's executed on the client-side by web browsers.

// Example JavaScript code
console.log('Hello, World!');

Try it yourself:

Variables and Data Types

JavaScript supports various data types, including numbers, strings, and booleans. Variables are declared using let, const, or var.

let name = 'John';
const age = 30;
var isAdmin = true;

Interactive Example:

Control Structures

Control structures like if/else statements and loops are used to control the flow of your JavaScript code.

if (age > 18) {
 console.log('You are an adult.');
} else {
 console.log('You are a minor.');
}

Interactive If/Else Example:

Functions

Functions are reusable blocks of code that perform a specific task. They can take arguments and return values.

function greet(name) {
 console.log(`Hello, ${name}!`);
}
greet('Alice');

Interactive Greeting Example:

Basic DOM Manipulation

JavaScript can interact with the Document Object Model (DOM) to dynamically change web page content.

document.getElementById('myElement').innerHTML = 'New content!';

Try it yourself:

Original content.