Modern Front-End Development for Rails

Using Enums and Literal Types

TypeScript is nothing if not chock-full of many different ways to specify a type that is limited to a few values. We’ve just looked at literal types, but those are effectively just a subset of what you can do in TypeScript using an enumerated type, or enum.

Defining Enums

TypeScript enums are very flexible and allow you to do a lot of things that seem, frankly, to be rather pointless. I’ll try to minimize talking about those.

At the simplest, you can define an enum in TypeScript just by providing a list of values for it. So if we wanted to convert our TicketStatus type to an enum, we could do this:

chapter_14/02/app/packs/contexts/venue_types.ts

export enum TicketStatus {
  Unsold,
  Held,
  Purchased,
 Refunded, ...