Enum

enum UserResponse {
  No = 0,
  Yes = 1,
}

function respond(recipient: string, message: UserResponse): void {
  console.log(recipient, message); // "Princess Caroline",  1
}

respond("Princess Caroline", UserResponse.Yes);

Source: typescriptlang.org

Enum

An enumeration is a set of symbolic names (members) bound to unique, constant values. Within an enumeration, the members can be compared by identity, and the enumeration itself can be iterated over.

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