Welcome to the Full JavaScript Course for Beginners! In this course, we will cover the basics of JavaScript, including syntax, data types, variables, functions, control flow, and more.
Introduction to JavaScript
JavaScript is a popular programming language used for web development. It allows developers to create interactive and dynamic websites by adding functionality to HTML and CSS. JavaScript is a client-side language, meaning it runs on the user's computer rather than the web server.
JavaScript was first introduced in 1995 and has since become one of the most widely used programming languages in the world. It is supported by all modern web browsers and can also be used on the server-side with Node.js.
Setting Up Your Environment
Before we get started with coding, we need to set up our environment. To write JavaScript code, you need a text editor and a web browser. You can use any text editor you are comfortable with, such as Visual Studio Code, Sublime Text, or Atom.
To run JavaScript code, you can use any modern web browser, such as Chrome, Firefox, or Safari. All modern browsers have a built-in JavaScript engine that can execute JavaScript code.
Your First JavaScript Program
Let's start with a simple "Hello, World!" program in JavaScript. Open your text editor and create a new file called index.html. Add the following code:
<!DOCTYPE html> <html> <head> <title>Hello, World!</title> </head> <body> <h1>Hello, World!</h1> <script> console.log("Hello, World!");
This code creates a basic HTML page with a heading that says "Hello, World!" and a script tag that contains our JavaScript code. The `console.log()` function is used to print the message "Hello, World!" to the browser console.
Save the file in your web browser. You should see the "Hello, World!" message printed to the console.
Variables
In JavaScript, you can store values in variables. Variables are used to store data that can be used later in your program. To create a variable in JavaScript, use the `var`, `let`, or `const` keyword followed by the variable name and the initial value.
var x = 10; // using var keyword to declare and assign a variable
let y = 20; // using let keyword to declare and assign a variable
const z = 30; // using const keyword to declare and assign a constant
Variables declared with `var` are function-scoped, meaning they are only accessible within the function in which they are defined. Variables declared with `let` and `const` are block-scoped, meaning they are only accessible within the block in which they are defined.
Data Types
JavaScript has several built-in data types, including numbers, strings, booleans, null, and undefined.
var num = 10; // number var str = "Hello"; // string var bool = true; // boolean var nul = null; // null var undef; // undefined
In addition to these primitive data types, JavaScript also has two complex data types: arrays and objects.
var arr = [1, 2, 3]; // array var obj = { // object name: "John", age: 30, city: "New York" };
Operators
JavaScript has several operators that can be used to perform operations on variables and values. These include arithmetic operators, comparison operators, logical operators, and assignment operators.
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