JavaScript/Basic Programs/Program

Hello World

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

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

Output

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:

javascript
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!

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