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Primitives
TypeScript builds on JavaScript by adding types, so we can describe exactly what kind of values a variable
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Start typescript Curriculum
Explore our comprehensive collection of typescript exercises. From basics to advanced patterns.
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Functions Basics
Functions are how we structure behavior. In TypeScript, you can describe parameter types and return types so
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Object Types Basics
Objects model real-world entities. In TypeScript, you describe an object's shape by listing its properties
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Arrays
Arrays are ordered lists of values written as T[] or Array<T>: `typescript const numbers: number[] = [1, 2,
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Union & Litteral Types
Union types let a value be one of several possibilities, while literal types restrict values to exact
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Type Aliases
Type aliases give a name to any type so you can reuse it throughout your code: `typescript type UserId =
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Interfaces
Interfaces describe the shape of an object: `typescript interface User { id: number; name: string; email?:
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null & undefined
When strict null checks are on, null and undefined must be handled explicitly. This helps you avoid crashes
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Type Assertions
Type assertions tell TypeScript how to treat a value. They do not change runtime behavior—they only affect
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any (vs unknown)
any turns off type checking completely. It spreads quickly through your code and hides bugs. Prefer unknown
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Type Guards & Narrowing
Type guards help the compiler figure out which shape a value has at a given point. When a check succeeds,
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Generics Fundamentals
Generics let you write components that work over many types without losing type safety: `typescript function
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Functions: Call Signatures & Overloads
Functions are the heart of TypeScript programs. You can describe a function's shape with a call signature:
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Creating Types from Types (Utility Patterns)
Utility types help you reshape and remix existing types without rewriting them: `typescript type User = { id:
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Object Types (Deep Dive)
This deep dive builds on basic object types with advanced patterns: Intersections – Combine multiple types
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keyof, typeof & Indexed Access
This category links runtime values to static types using powerful type operators: keyof – Get all property
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