Why Learn TypeScript?
TypeScript has become the industry standard for professional JavaScript development. Most major frameworks (React, Angular, Vue 3, Next.js) have first-class TypeScript support.
Catch Bugs Early
Type errors caught at compile time, not runtime
Self-Documenting
Types serve as inline documentation
Better Tooling
Autocomplete, refactoring, navigation
TypeScript Learning Path
Level 1: Type Foundations
- Type Annotations
- Type Inference
- Primitive Types
- Arrays
- Tuples
- Enums
Level 2: Intermediate Types
- Interfaces
- Type Aliases
- Union Types
- Intersection Types
- Literal Types
- Type Guards
Level 3: Functions
- Function Types
- Optional Parameters
- Default Parameters
- Rest Parameters
- Overloads
- this Types
Level 4: Object Types
- Object Types
- Index Signatures
- Readonly
- Mapped Types
- Conditional Types
- Template Literals
Level 5: Generics
- Generic Functions
- Generic Interfaces
- Generic Classes
- Constraints
- Default Types
- Utility Types
Level 6: Advanced
- Declaration Files
- Module Augmentation
- Decorators
- Mixins
- Branded Types
- Type Narrowing
Projects You'll Build
Type-Safe API Client
Build a fully typed HTTP client with generics for any API response.
React Component Library
Create reusable components with proper TypeScript props and generics.
Express.js Backend
Type-safe routes, middleware, and database models.
CLI Tool
Build a command-line application with typed arguments and config.
Prerequisites
TypeScript builds on JavaScript. You should understand:
- JavaScript fundamentals (variables, functions, objects)
- ES6+ features (arrow functions, destructuring, modules)
- Basic OOP concepts (classes, inheritance)
New to JavaScript? Start with our JavaScript path →
Start Learning TypeScript
From basic types to advanced generics. Get started for free.