Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums

Fri, 05 Dec 2025 00:00:00 +0000

Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums

Welcome back, intrepid TypeScript explorer! In our previous chapters, you’ve mastered the basics of declaring variables, defining functions, and creating your own custom types with type aliases and interface declarations. You’re building a solid foundation, and that’s fantastic!

Today, we’re going to unlock even more power and flexibility in TypeScript by learning how to combine and refine types. Imagine being able to say, “this variable can be either a number or a string,” or “this object must have the properties of both this type and that type.” That’s exactly what Union Types and Intersection Types allow us to do! We’ll also dive into Enums, a super handy way to define a set of related constants, making your code more readable and less prone to errors.

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Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums

Chapter 6: Combining and Refining Types: Unions, Intersections, and Enums