💙 TypeScript Course
Add type safety to your JavaScript projects. Learn TypeScript fundamentals and how to build scalable applications with confidence.
Know JavaScript? TypeScript is your next step.
Start with Lesson 1 — Introduction to TypeScript. We recommend finishing the JavaScript course first, but it's not required.
Start Your First LessonIntroduction to TypeScript
What TypeScript adds to JavaScript and how to set up your first TS project
Basic Types
string, number, boolean, arrays, tuples, and the any/unknown types
Interfaces and Type Aliases
Define the shape of objects and create reusable custom types
Functions and Generics
Type your function parameters and return values; write flexible generic functions
Classes and Objects
Access modifiers, readonly, abstract classes, and OOP in TypeScript
Advanced Types
Union, intersection, conditional types, mapped types, and utility types
TypeScript with React
Type your React components, props, hooks, and events correctly
TypeScript Best Practices
Real-world patterns, strictness settings, and tips for clean TS codebases