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javascript · beginner

JavaScript Fundamentals

Build a competitive JavaScript foundation: from variables to APIs, then ship a final project.

Read the chapter docs first. Practice unlocks after you finish the reading.

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Chapter 2: Data Types

Primitives · Read Locked
Coercion Check · Practice Locked

Chapter 3: Functions

First Function · Read Locked
Pure Helpers · Practice Locked

Chapter 4: Conditions

Branching · Read Locked

Chapter 5: Loops

Iterate · Read Locked

Chapter 6: Arrays

Array Basics · Read Locked
Transform · Practice Locked

Chapter 7: Objects

Object Shape · Read Locked

Chapter 8: DOM

Talking to the Page · Read Locked

Chapter 9: Async JavaScript

Promises · Read Locked

Chapter 10: APIs

Fetch Shape · Read Locked

Chapter 11: Final Project

Arena HUD · Project Locked