Getting Started with TypeScript

What TypeScript is, why it exists, and how to write your first typed program.

beginner

2

Variables

Declaring variables with let, const, and var — and why TypeScript makes variable declarations safer.

beginner

3

Basic Types

Primitive types, arrays, tuples, and special types like any, unknown, and never.

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4

Functions

Typed function parameters, return types, overloads, rest parameters, and higher-order functions.

beginner

5

Arrays & Tuples

Typed arrays, readonly arrays, tuples, and working with array methods in TypeScript.

beginner

6

Objects

Object types, index signatures, structural typing, object spread, and working with Object methods.

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7

Interfaces

Define object shapes with interfaces — the backbone of TypeScript's structural type system.

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8

Classes

TypeScript classes with access modifiers, readonly, abstract classes, and interface implementation.

intermediate

9

Enums

Named constant sets with numeric and string enums, const enums, and when to use them.

beginner

10

Union & Intersection Types

Combine types with | (union) and & (intersection), and use type aliases for reusable type definitions.

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11

Generics

Write reusable, type-safe functions and data structures with generics.

intermediate

12

Utility Types

TypeScript's built-in type transformers: Partial, Required, Readonly, Pick, Omit, Record, and more.

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13

Type Guards & Narrowing

Safely narrow union types at runtime using typeof, instanceof, in, and custom type guards.

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14

Async/Await

Type async functions, Promises, and handle errors in asynchronous TypeScript code.

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15

Modules & Namespaces

Organize TypeScript code with ES modules, export patterns, and declaration files.

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16

Error Handling

try/catch with unknown errors, custom error classes, Result types, and building robust error handling patterns.

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17

Advanced Types

Mapped types, conditional types, template literal types, and infer keyword.

advanced

Learn TypeScript

All Tutorials

Getting Started with TypeScript

Variables

Basic Types

Functions

Arrays & Tuples

Objects

Interfaces

Classes

Enums

Union & Intersection Types

Generics

Utility Types

Type Guards & Narrowing

Async/Await

Modules & Namespaces

Error Handling

Advanced Types

Why learn TypeScript?

What you'll learn in this TypeScript tutorial

TypeScript tutorial topics

Who is this TypeScript course for?