Introduction to JavaScript

What is Introduction to JavaScript?

Within Computer Science, which covers algorithms, programming, data, networks, hardware and safe, responsible use of technology, this topic explains Introduction to JavaScript. Computing topics explain how software, hardware and data work, with diagrams and models that show each step in order.

Check that you can explain Introduction to JavaScript in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Introduction to JavaScript helps you design, test and explain programs, websites and systems, from small projects to exam questions.

Introduction to JavaScript in detail

JavaScript is a programming language that makes web pages interactive. It runs in the browser and can respond to events such as clicks, change page content, validate forms, animate elements and fetch data. It has variables, functions, loops, conditionals and objects.

It works with the DOM (Document Object Model), the browser's representation of the HTML page, to find and change elements, such as document.getElementById("demo").innerHTML = "Hello". Along with HTML and CSS, it is one of the three core web technologies. With Node.js it can also run on servers. Despite the name, it is unrelated to Java.

How the interactive helps you understand Introduction to JavaScript

Click a step, or use the Previous and Next buttons, to move through the sequence one stage at a time. Auto-play moves on for you.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Introduction to JavaScript.

Real-life uses and examples

• Apply Introduction to JavaScript when you design a small program, website or spreadsheet.
• Explain Introduction to JavaScript to someone new to computing by comparing it to a familiar process.
• Trace through a process that uses Introduction to JavaScript to check what it does step by step.

Common mistakes to avoid

• Testing only the normal case and forgetting the edge cases.
• Using the term without being able to say what the computer actually does.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.