The “Hello World” program is the simplest program you can write in any programming language. It serves as a first step for beginners to get familiar with the syntax and environment of a new programming language. In JavaScript, the goal of this program is to print “Hello World” on the screen or console.
There are various methods to print Hello World on the screen. These are –
- Using console.log() Method
- Using alert() Method
- Using document.write() Method
1. Using console.log() Method
The console.log() method display output in the browser’s developer console. This is one of the most frequently used methods to print messages for debugging and development purposes.
// Print Hello World on browser console
console.log("Hello World");
In above example, the string "Hello World" is logged to the console.
2. Using alert() Method
The alert() method creates a pop-up dialog box displaying the message. This method is useful for alerting users to important information.
// Display Hello World in an alert box
alert("Hello World");
This will open a pop-up box in the browser with the message “Hello World”.
3. Using document.write() Method
The document.write() method writes directly to the web page. Although not commonly used in modern development (as it can overwrite the page content). It is useful for understanding how JavaScript can interact with the DOM.
// Write Hello World directly to the document
document.write("Hello World");
This method will display the text “Hello World” on the webpage itself, not in the console.