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typescript

TypeScript

Static types, generics, and tooling that compiles to JavaScript.

Mode
client_typescript
Practice
In-browser TS
Lessons
32 units
Start lesson 1 → Introduction to TypeScript

Before you start

A typed superset of JavaScript: annotations, interfaces, generics, narrowing, and project configuration.

Types catch whole classes of bugs before runtime and improve editor support on larger codebases.

Modern front-end apps, Node APIs, and any team that standardizes on TS-first tooling.

Client-side compile-then-run playground, structured modules, enrichment sections, and three MCQs per lesson.

After you are comfortable with JavaScript basics—before React/Vue/Angular tracks that assume TS.

Lesson order

Sequential — follow top to bottom

32 lessons are live in this track. Start from step 01 for the smoothest path.

  1. 01 intro Introduction to TypeScript

    beginner

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  2. 02 why-typescript Why TypeScript?

    beginner

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  3. 03 ts-vs-javascript TypeScript vs JavaScript

    beginner

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  4. 04 setup-and-tooling Setup and tooling

    beginner

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  5. 05 primitive-types Primitive types

    beginner

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  6. 06 arrays-tuples Arrays and tuples

    beginner

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  7. 07 object-types Object types

    beginner

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  8. 08 unions-literals Unions and literal types

    beginner

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  9. 09 any-unknown-never any, unknown, and never

    beginner

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  10. 10 type-assertions Type assertions

    beginner

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  11. 11 interfaces Interfaces

    intermediate

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  12. 12 type-aliases Type aliases

    intermediate

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  13. 13 optional-readonly Optional and readonly

    intermediate

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  14. 14 enums Enums

    intermediate

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  15. 15 index-signatures Index signatures

    intermediate

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  16. 16 typed-functions Typed functions

    intermediate

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  17. 17 function-overloads Function overloads

    intermediate

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  18. 18 generics-basics Generics basics

    intermediate

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  19. 19 generic-constraints Generic constraints

    intermediate

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  20. 20 utility-types-intro Utility types (intro)

    intermediate

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  21. 21 type-narrowing Type narrowing

    intermediate

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  22. 22 discriminated-unions Discriminated unions

    intermediate

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  23. 23 exhaustiveness Exhaustiveness checking

    intermediate

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  24. 24 nullability Nullability

    intermediate

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  25. 25 es-modules-types ES modules and types

    intermediate

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  26. 26 tsconfig-basics tsconfig.json basics

    intermediate

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  27. 27 strict-mode Strict mode flags

    advanced

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  28. 28 declarations-ambient Declarations and ambient types

    advanced

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  29. 29 classes-in-ts Classes in TypeScript

    intermediate

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  30. 30 typed-api-project Project: typed API client

    advanced

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  31. 31 interview-essentials TypeScript interview essentials

    advanced

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  32. 32 summary Track summary

    beginner

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