What is TypeScript Enum and how does it ensure type safety?

What is TypeScript Enum and how does it ensure type safety?

TypeScript Enum is a special data type that allows you to define a set of named constants. It enhances type safety by ensuring that only predefined values can be assigned to a variable.

Can you give me an example of how to use an Enum in TypeScript?

Sure! Here's a simple example:

enum Direction {
    Up,
    Down,
    Left,
    Right
}

let move: Direction = Direction.Up;

This restricts the move variable to only accept values defined in the Direction enum.

What happens if I try to assign a value outside the Enum?

If you try to assign a value that is not part of the Enum, TypeScript will throw a compile-time error, helping you catch mistakes early.

Are there any performance implications of using Enums?

Enums are generally efficient, but they can increase the bundle size slightly. However, the benefits of type safety usually outweigh the costs.