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Enums: Named Constants

Beginner
70 XP
25 min
Lesson Content

Enums in TypeScript

Enums allow you to define a set of named constants, making your code more readable and maintainable.

Numeric Enums

enum Direction {
  Up,
  Down,
  Left,
  Right
}

let move: Direction = Direction.Up;

String Enums

enum Status {
  Pending = "PENDING",
  Approved = "APPROVED",
  Rejected = "REJECTED"
}

Using Enums

function getStatusMessage(status: Status): string {
  switch (status) {
    case Status.Pending:
      return "Please wait...";
    case Status.Approved:
      return "Approved!";
    case Status.Rejected:
      return "Rejected.";
  }
}
Example Code

Create and use enums for constants

enum Priority {
  Low = "LOW",
  Medium = "MEDIUM",
  High = "HIGH"
}

function getPriorityMessage(priority: Priority): string {
  return `Priority: ${priority}`;
}

console.log(getPriorityMessage(Priority.High));

Expected Output:

Priority: HIGH
Study Tips
  • •Read the theory content thoroughly before practicing
  • •Review the example code to understand key concepts
  • •Proceed to the Practice tab when you're ready to code