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JS Playground

Discover what JavaScript is and write your first lines of code. Learn variables, constants, and the browser console.

Discover why JavaScript was created and what role it plays on every web page you visit.

Meet the browser console — your built-in playground for writing and testing JavaScript instantly.

Learn how to store and update values using variables — the building blocks of every program.

Learn how to declare values that never change using the const keyword.

Learn how to leave notes in your code and name variables clearly.

Put everything together by building a tip calculator that computes how much to tip at a restaurant.

Create a real JavaScript file on your computer and run it in the browser to build a working tip calculator page.