S07 L02 TypeScript Custom Types, Union Types, and Functions

Description

📘 TYPESCRIPT CUSTOM TYPES, UNION TYPES, AND FUNCTIONS In this lesson, we continue the TypeScript tutorial by defining custom object types, using union types, and applying type annotations to regular and arrow functions. You will also see generic functions, a key concept used heavily in modern TypeScript and React code. 🎯 IN THIS VIDEO Create custom TypeScript object types with required and optional properties Validate object assignments against custom type definitions Prevent unexpected properties with strict type checking Use union types to allow multiple valid type options Add parameter and return type annotations to regular functions Add parameter and return type annotations to arrow functions Use concise conditional return expressions in typed functions Introduce generic functions and infer concrete types from usage 🚀 HOW TO USE THIS COURSE This lesson builds the TypeScript language foundation needed for real app code. Custom types, unions, and generics are all essential when modeling data and writing reusable typed functions in React projects. 👉 Course Website: www.richardbraycourses.co.uk 👉 Course Repositories: www.github.com/RichardBrayCourses 👉 Full course playlist: https://youtube.com/playlist?list=PLNlOxdq7xu14b5ewH4IJC9tMinkgZBuVR&si=Pg8pEDR5UUbQstz6 📂 SECTION REPOSITORY Section 7 repository: https://github.com/RichardBrayCourses/frontend07-typescript 💡 NOTE Generics preserve type information across function inputs and outputs, helping you avoid any while keeping code reusable.