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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+ codders inscritos

  • Apto para principiantes
  • sparkles iconAyuda de codificación con IA
  • hint iconLecciones interactivas prácticas
  • volume On iconNarración de audio en cada lección
  • quiz iconCuestionarios para poner a prueba tu conocimiento
  • certificate iconCertificado gratuito de finalización

Programa

1 secciones2 proyectos73 lecciones58 retos438 preguntas de quiz

Esta sección forma parte del Journey de JavaScript. El programa completo tiene más secciones - haz clic en cualquier vista previa de abajo para verla en la página del Journey.

  1. Sección 1Fundamentos77 lecciones
  2. Sección 2Lógica y Flujo65 lecciones
  3. Empezar secciónEmpezarExpandirContraerIntroducción a TypeScript después de haber aprendido sobre JavaScript

    Primeros pasos con TS

    5 lecciones232

    Tipos principales

    7 lecciones748

    Estructura de datos: Arrays y Tuplas

    9 lecciones862

    Trabajando con funciones

    8 lecciones855

    Tipos: Alias, Uniones e Intersecciones

    7 lecciones751

    Tipado de Objetos e Interfaces

    8 lecciones757

    Proyecto: Una lista de tareas simple

    Proyecto6 lecciones18

    Enums

    6 lecciones638

    Genéricos: Un primer vistazo

    6 lecciones537

    Proyecto: Gestión de inventario

    Proyecto5 lecciones18

    Temas avanzados

    6 lecciones642
  4. Sección 4Programación Orientada a Objetos56 lecciones

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 Introducción a TypeScript with Coddy

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