Hello World

The classic first program that prints "Hello World" to the console

BeginnerTopic: Basic Programs

JavaScript Hello World Program

This program helps you to learn the fundamental structure and syntax of JavaScript programming.

// The simplest JavaScript program
console.log("Hello World");

Output

Hello World

Understanding Hello World

The "Hello World" program is the first step towards learning any programming language and is one of the most straightforward programs you will learn. It demonstrates the basic working of JavaScript code execution.

Console.log()

The console.log() function is used to output messages to the browser's console or Node.js terminal. It's the primary way to display information during development and debugging.

Syntax:

console.log(value1, value2, ..., valueN);

How it works:

•Takes one or more values as arguments

•Converts them to strings if needed

•Displays them in the console

•Returns undefined

Why "Hello World"?

•Traditional first program in programming

•Tests that your environment is set up correctly

•Confirms JavaScript is working

•Simple introduction to syntax

Running JavaScript:

Browser:

Open Developer Tools (F12) → Console tab

Node.js:

Run node filename.js in terminal

HTML:

Include in <script> tag

This program is the foundation for all JavaScript learning!

Let us now understand every line and the components of the above program.

Note: To write and run JavaScript programs, you need to set up the local environment on your computer. Refer to the complete article Setting up JavaScript Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your JavaScript programs.

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