What is JavaScript?

JavaScript is a powerful programming language that can add interactivity to a website. It was invented by Brendan Eich.

JavaScript is versatile and beginner-friendly. With more experience, you'll be able to create games, animated 2D and 3D graphics, comprehensive database-driven apps, and much more!

A "Hello world!" example

JavaScript is one of the most popular modern web technologies! As your JavaScript skills grow, your websites will enter a new dimension of power and creativity.

However, getting comfortable with JavaScript is more challenging than getting comfortable with HTML and CSS. You may have to start small, and progress gradually. To begin, let's examine how to add JavaScript to your page for creating a Hello world! example.

1. Go to your test site and create a new folder named scripts. Within the scripts folder, create a new text document called main.js, and save it.

2. In your index.html file, enter this code on a new line, just before the closing body tag:

<script src="scripts/main.js"></script>

3. This is doing the same job as the link element for CSS. It applies the JavaScript to the page, so it can have an effect on the HTML (along with the CSS, and anything else on the page).

4. Add this code to the main.js file:

const myHeading = document.querySelector("h1");
  myHeading.textContent = "Hello world!";

5. Make sure the HTML and JavaScript files are saved. Then load index.html in your browser. You should see something like this:

Hello World!