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Learn TypeScript

A free, interactive TypeScript course built on top of JavaScript. You write TS on every lesson - type annotations, interfaces, generics, unions, narrowing - with AI hints when you get stuck and a certificate when you finish. Part of the wider JavaScript journey, so the JS context that makes TypeScript click is right there.

253,075+ 명의 codders가 등록함

  • 초보자 환영
  • sparkles iconAI 코딩 도우미
  • hint icon실습 중심의 대화형 강의
  • volume On icon모든 레슨에 음성 나레이션 제공
  • quiz icon지식을 확인하는 퀴즈
  • certificate icon무료 수료증

커리큘럼

1 섹션2 프로젝트73 개 강의58 챌린지438 퀴즈 문제

이 섹션은 JavaScript 여정의 일부입니다. 전체 커리큘럼에는 더 많은 섹션이 있어요 - 아래 미리보기를 클릭하면 여정 페이지에서 확인할 수 있습니다.

  1. 섹션 1기초77 개 강의
  2. 섹션 2논리 & 흐름65 개 강의
  3. 섹션 시작하기시작펼치기접기JavaScript에 대해 배운 후 TypeScript 소개

    TS 시작하기

    5 개 강의232

    핵심 타입

    7 개 강의748

    자료구조: 배열과 튜플

    9 개 강의862

    함수 활용하기

    8 개 강의855

    타입: 별칭, 유니온 및 인터섹션

    7 개 강의751

    객체와 인터페이스 타입 정의

    8 개 강의757

    프로젝트: 간단한 할 일 목록

    프로젝트6 개 강의18

    열거형

    6 개 강의638

    제네릭: 살펴보기

    6 개 강의537

    프로젝트: 재고 관리

    프로젝트5 개 강의18

    고급 주제

    6 개 강의642
  4. 섹션 4객체 지향 프로그래밍56 개 강의

Why learn TypeScript with Coddy

  • Write TypeScript in your browser. No tsc install, no editor setup, no tsconfig.json to wrangle. The editor and output sit side-by-side so you see what each type does instantly.
  • Modern TypeScript: type annotations, interfaces, generics, union and intersection types, narrowing, utility types, and how TS layers on top of plain JavaScript without changing what runs at runtime.
  • AI hints help you read TypeScript errors - the famously long ones - without spoiling the fix, so you build the mental model that makes future TS code easier to write.
  • Free TypeScript certificate when you finish the section. A credible signal that you can read and write idiomatic TS, not just JavaScript with sprinkled types.

Frequently asked questions about learning TypeScript

What is TypeScript?

TypeScript is a superset of JavaScript that adds optional static typing. Valid JavaScript is valid TypeScript, but TS lets you annotate variables, function parameters, and return values with types - the compiler then catches mistakes before your code runs. At runtime, TypeScript compiles down to plain JavaScript.

Is TypeScript hard to learn?

If you're comfortable with JavaScript, the basics of TypeScript are quick to pick up - adding : string or : number to a few variables and you're already writing TS. The trickier parts (generics, conditional types, mapped types, narrowing) take longer, and this course introduces them in small steps with hands-on examples.

Do I need to know JavaScript before TypeScript?

Yes. TypeScript is JavaScript with types on top, so the language you're really learning is JS. This TypeScript section is part of the JavaScript journey for that reason - you can take the JS sections first, or jump straight to TS if you're already comfortable with modern JavaScript.

What's the difference between TypeScript and JavaScript?

JavaScript is dynamically typed - a variable can hold a string today and a number tomorrow, and you only find out at runtime. TypeScript adds a static type layer that runs at build time, catching type mismatches before the code ships. The compiled output is still plain JavaScript, so it runs anywhere JS does.

Can I learn TypeScript online for free?

Yes. The interactive TypeScript section is free - full lessons, coding exercises, quizzes, and a certificate. The editor runs in your browser with the TS compiler built in, so you don't need to install tsc, Node, or any tooling to start writing TypeScript.

Do I get a certificate after the TypeScript course?

Yes. Finishing the TypeScript section gives you a free certificate of completion you can share on LinkedIn or include on your resume. A verifiable signal that you've worked through structured, hands-on TypeScript material, not just watched tutorials.
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Learn TypeScript 소개 with Coddy

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