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TypeScript Essentials🔷

Beginner→Intermediate

TypeScript 5.9

Add type safety to your JavaScript with TypeScript, from basics to advanced patterns.

7

Sections

21

Lessons

21

Challenges

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21 lessons and 21 challenges, all 100% free.

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Why TypeScript?

Type Annotations

Fix the Type Error(Sign in required)

Beginner+10 Mana

Compiler Configuration

Prevent Implicit Any(Sign in required)

Beginner+10 Mana

Setting Up a TypeScript Project(Sign in required)

Beginner+10 Mana

Primitives, Arrays, and Any

Functions and Object Types

Type an Array(Sign in required)

Beginner+10 Mana

Tuples and Special Types

Defining an Object Shape(Sign in required)

Beginner+10 Mana

Tuple Type Matching(Sign in required)

Beginner+10 Mana

Classes & Access Modifiers

Fix Private Access(Sign in required)

Intermediate+20 Mana

Abstract Classes and Readonly

Create a Status Enum(Sign in required)

Beginner+10 Mana

Class Features(Sign in required)

Beginner+10 Mana

Interfaces vs Type Aliases

Type Aliases, Unions, and Intersections

Create a Car Interface(Sign in required)

Beginner+10 Mana

Declaration Merging

Extend an Interface(Sign in required)

Beginner+10 Mana

Type vs Interface Capabilities(Sign in required)

Beginner+10 Mana

Narrowing Techniques

Define a Union(Sign in required)

Intermediate+20 Mana

Discriminated Unions

Narrowing with typeof(Sign in required)

Intermediate+20 Mana

Predict the Output(Sign in required)

Intermediate+20 Mana

Type Assertions (Casting)

Safe Unknown Check(Sign in required)

Intermediate+20 Mana

The satisfies Operator

Assert as String(Sign in required)

Beginner+10 Mana

The satisfies Operator(Sign in required)

Intermediate+20 Mana

Generics: Types as Variables

Generic Constraints

Generic Interface(Sign in required)

Intermediate+20 Mana

Const Type Parameters

Generic Function Parts(Sign in required)

Intermediate+20 Mana

Complete the Constraint(Sign in required)

Intermediate+20 Mana

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21 interactive lessons and 21 hands-on challenges — learn in VS Code, Cursor, or the web.