Web developmentIntermediate Popular

TypeScript Foundations

JavaScript with a compiler on your side.

Add a dependable type system to JavaScript. Learn inference, object contracts, narrowing, generics and the compiler settings that catch real bugs before your users do.

10 lessons 2 hours Certificate included Self-paced

Start the first lesson View curriculum

Reviewed and updated October 2026 · Free to start

What you will learn

By the end, you can do this.

Model real data with interfaces and type aliases
Narrow unions safely instead of using any
Write reusable generic functions with constraints
Configure a strict TypeScript project

Curriculum

10 lessons in 1 module

290 practice drills included for extra repetition

0/10 complete

01Primitive types and arraysLearn the simple value types in TypeScript and the array types that hold many of them. 10 min 02Functions and return typesAnnotate what a function takes in and what it gives back so mistakes surface before the code runs. 11 min 03Objects and readonlyDescribe the shape of an object once and let the compiler keep every use of it honest. 11 min 04Narrowing in practiceUse small runtime checks so the compiler knows which type a value really is inside each branch. 12 min 05tsconfig for beginnersRead the most common compiler flags and understand what each one actually changes. 10 min 06Types and inferenceTypeScript checks JavaScript before it runs and infers most types for you. 12 min 07Interfaces and type aliasesDescribe object shapes once and reuse the contract across your application. 13 min 08Unions and narrowingModel uncertain states explicitly and let the compiler prove which branch is safe. 14 min 09Generics that stay readableWrite one typed function for many value types without losing safety. 15 min 10A strict project you can trustConfigure the compiler so it catches bugs instead of adding ceremony. 12 min

Certification

Finish the course. Prove the skill.

Complete every lesson, then pass a timed assessment to earn the TypeScript Foundations Certificate. Each credential has a unique ID and a QR code that resolves to a live public record.

10 randomized questions
30 minute limit · 80% to pass
3 attempts per enrolment
Verifiable by QR or credential ID

Certification details Verify a credential

Pro members get five certification attempts and unlimited timed mock exams. Compare Pro

EduByte.tech

EduByte · Skills certificationIssued 26 Oct 2026

This certifies that

Your name

has successfully completed the assessed program

TypeScript Foundations

Model real data with interfaces and type aliasesNarrow unions safely instead of using anyWrite reusable generic functions with constraints

TypeScript Foundations

By the end, you can do this.

10 lessons in 1 module

Finish the course. Prove the skill.

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