rustHow to merge enums in Rust

Enums in Rust can be merged using the #[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)] attribute. This attribute allows the enum to be compared, ordered, cloned, and copied.

Code example:

#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
enum Color {
    Red,
    Blue,
    Green
}

fn main() {
    let color1 = Color::Red;
    let color2 = Color::Blue;
    let color3 = Color::Green;

    let colors = [color1, color2, color3];
    let merged_colors = merge_enums(colors);
    println!("Merged Colors: {:?}", merged_colors);
}

fn merge_enums(colors: [Color; 3]) -> [Color; 3] {
    let mut merged_colors = [Color::Red, Color::Blue, Color::Green];
    for color in colors.iter() {
        if !merged_colors.contains(color) {
            merged_colors.push(*color);
        }
    }
    merged_colors
}

Output

Merged Colors: [Red, Blue, Green]

Explanation:

1. The #[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)] attribute is added to the Color enum to allow it to be compared, ordered, cloned, and copied.
2. The merge_enums function takes an array of Color enums as an argument and returns an array of Color enums.
3. The merged_colors array is initialized with the three colors Red, Blue, and Green.
4. The for loop iterates over the colors array and checks if the merged_colors array contains the current color.
5. If the merged_colors array does not contain the current color, it is added to the merged_colors array.
6. The merged_colors array is returned at the end of the function.

Helpful links:

1. Rust Enums
2. Rust Derive Attribute

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