What are some advanced usage patterns for TypeScript enums?

What are some advanced usage patterns for TypeScript enums?

TypeScript enums can be used in various advanced ways, such as computed enums, heterogeneous enums, and more. Would you like examples?

Yes, please provide examples of computed and heterogeneous enums.

Sure! A computed enum allows you to define values based on expressions. For example:

enum Status {
    Active = 'ACTIVE',
    Inactive = 'INACTIVE',
    Pending = 'PENDING'
}

A heterogeneous enum can mix string and numeric values:

enum Mixed {
    No = 0,
    Yes = 'YES'
}

How do I use enums in switch statements?

You can use enums in switch statements to handle different cases. For example:

function getStatusMessage(status: Status) {
    switch (status) {
        case Status.Active:
            return 'User is active.';
        case Status.Inactive:
            return 'User is inactive.';
        default:
            return 'Unknown status.';
    }
}

Can I extend enums in TypeScript?

No, TypeScript enums cannot be extended like classes. However, you can create a new enum that includes values from an existing one.