How to Iterate Over Enum Variants in Rust

Use the #[derive(Debug)] attribute on your enum and then iterate over the variants using a match expression or a helper function if you need to access all variants programmatically.

#[derive(Debug)]
enum ShirtColor {
    Red,
    Blue,
}

fn main() {
    let colors = [ShirtColor::Red, ShirtColor::Blue];
    for color in &colors {
        println!("{:?}", color);
    }
}

If you need to iterate over all variants without manually listing them, you must implement a custom iterator or use a macro like strum since Rust does not provide built-in reflection for enums.

Rust enums are a way to define a type that can be one of several specific options, like a shirt color being either red or blue. You cannot automatically loop through all possible options because the compiler needs to know exactly what they are at compile time. To list them, you usually have to write them out in a list or use a special tool that generates the code for you.