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Rails for Front-end Development: Essential Tools

Building Mapped Types and Utility Types

Explore how to create mapped types and leverage built-in utility types in TypeScript to build flexible, maintainable, and robust type systems. Understand how these advanced types help reduce errors by enabling reusable and dynamic type transformations.

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TypeScript types

In addition to limiting variables to a set of specific literal values and defining enums, TypeScript allows us to define types that are based on other types, much like super-powered generics. These are called mapped types. TypeScript also has many predefined mapped types that it calls utility types.

So, let’s say we have our existing type TicketData:

interface TicketData {
...