What are enum types in TypeScript and can you give me some examples?

What are enum types in TypeScript and can you give me some examples?

Enum types in TypeScript are a way to define a set of named constants. For example, you can define an enum for colors like this:

enum Color {
    Red,
    Green,
    Blue
}

You can then use it like this:

let myColor: Color = Color.Red;

Can you show me how to use string enums?

Sure! String enums allow you to assign string values to the enum members. Here's an example:

enum Direction {
    Up = "UP",
    Down = "DOWN",
    Left = "LEFT",
    Right = "RIGHT"
}

You can use it like this:

let move: Direction = Direction.Up;

What about numeric enums?

Numeric enums are the default in TypeScript. They automatically assign numeric values starting from 0. For example:

enum Status {
    Active,
    Inactive,
    Pending
}

Here, Active is 0, Inactive is 1, and Pending is 2.

Can enums have computed values?

Yes, enums can have computed values. For instance:

enum FileAccess {
    None,
    Read = 1 << 1,
    Write = 1 << 2,
    ReadWrite = Read | Write
}

In this case, ReadWrite will have a value of 6.