TypeScript for Beginners

For those who know JavaScript basics. Types and inference, unions and narrowing, object types and interfaces, functions, classes, generics, utility types, async code and setting up a project.

Free14 modules130 lessons≈ 6 h

The course has no coding exercises, so you need nothing installed to take it. To try the lesson examples, open them in the TypeScript Playground in your browser, or set up your computer in three steps.

Try the Playground
The TypeScript Playground checks your code as you type, shows the JavaScript the compiler writes from it and runs it. Strict mode is on there, as in the course.
2
Install Node.js
Pick the LTS version of Node.js, 22.18 or newer.
- Download the installer for your system from nodejs.org/en/download and run it.
- The guide Running TypeScript natively shows how Node.js runs a .ts file: it removes the types and does not check them.
3
Install TypeScript and VS Code
The compiler tsc is what checks the types. The course uses TypeScript 7.
- The page Download TypeScript shows how to add it to your computer or to a project.
- VS Code understands TypeScript out of the box and underlines type errors as you type: see TypeScript in Visual Studio Code.

Set up your computer

Try the Playground

Install Node.js

Install TypeScript and VS Code

Syllabus

01First steps≈ 20 min7 lessons

02Annotations and type inference≈ 20 min9 lessons

03Primitive and special types≈ 20 min8 lessons

04Unions and literal types≈ 20 min8 lessons

05Object types≈ 20 min7 lessons

06Arrays and tuples≈ 20 min7 lessons

07Narrowing≈ 30 min12 lessons

08Interfaces and structural typing≈ 30 min12 lessons

09Functions≈ 25 min10 lessons

10Classes≈ 35 min12 lessons

11Generics≈ 25 min10 lessons

12Type operators and utility types≈ 25 min8 lessons

13Async code and outside data≈ 30 min10 lessons

14A TypeScript project≈ 30 min10 lessons