Rails for Front-end Development: Essential Tools/

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Using Enums and Literal Types

Using Enums and Literal Types

In this lesson, we'll use enums and literal types.

We'll cover the following...

TypeScript includes many different ways to specify a type that is limited to a few values. We’ve just looked at literal types, but those are merely a subset of what we can do in TypeScript using an enumerated type, or enum.

Defining enums

The flexibility of TypeScript enums allows us to do many things that at first may seem unuseful.

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

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export enum TicketStatus {
  Unsold,
  Held,
  Purchased,
  Refunded,
  Invalid,
}

We can then use these statuses as TicketStatus.Unsold, TicketStatus.Held, and so on. Conventionally, the individual elements of the enum are ...