rustHow to declare enum in Rust

Enums in Rust are declared using the enum keyword, followed by the name of the enum and a set of variants in curly braces. Each variant can optionally have associated data, such as a string or integer. For example, the following code declares an enum called Color with three variants: Red, Green, and Blue. Each variant has an associated integer value.

enum Color {
    Red = 0,
    Green = 1,
    Blue = 2,
}

The code above will create an enum with three variants, each with an associated integer value. The output of this code will be a type called Color that can be used to store values of type Color.

output example
Color

The enum can then be used to store values of type Color in a variable. For example, the following code creates a variable called my_color and assigns it the value Color::Red.

let my_color = Color::Red;

The enum can also be used to match against values. For example, the following code will print out a message depending on the value of my_color.

match my_color {
    Color::Red => println!("The color is red"),
    Color::Green => println!("The color is green"),
    Color::Blue => println!("The color is blue"),
}

Output example:

The color is red

Enums in Rust are a powerful tool for creating types that can store multiple values. They can be used to store values of a specific type, as well as to match against values.

Helpful links

• Rust Enums
• Rust Match
• Rust Enum Variants

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