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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.

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Programa

1 seções2 projetos73 lições58 desafios438 perguntas de quiz

Esta seção faz parte do Journey de JavaScript. O programa completo tem mais seções - clique em qualquer prévia abaixo para vê-la na página do Journey.

  1. Seção 1Fundamentos77 lições
  2. Seção 2Lógica & Fluxo65 lições
  3. Começar seçãoIniciarExpandirRecolherIntrodução ao TypeScript após aprender sobre JavaScript

    Primeiros Passos com TS

    5 lições232

    Tipos Principais

    7 lições748

    Estrutura de Dados: Arrays e Tuplas

    9 lições862

    Trabalhando com Funções

    8 lições855

    Tipos: Aliases, Uniões e Interseções

    7 lições751

    Tipagem de Objetos e Interfaces

    8 lições757

    Projeto: Uma Lista de Tarefas Simples

    Projeto6 lições18

    Enums

    6 lições638

    Generics: Uma Primeira Olhada

    6 lições537

    Projeto: Gerenciamento de Inventário

    Projeto5 lições18

    Tópicos Avançados

    6 lições642
  4. Seção 4Programação Orientada a Objetos56 lições

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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