Rust Platform

Working with Enums

Level: intro (score: 1)

🎯 In Python, you might use strings, integers, or even the built-in enum.Enum to represent fixed states.

In Rust, enums go further: they can define variants and store data inside those variants.

For now, we’ll start with the simpler case — basic variants without extra data.

✅ Your task:

Implement the TrafficLight enum with the following variants:

• Red
• Yellow
• Green

Then implement the function action(light: TrafficLight) -> &'static str which returns:

• "stop" for Red
• "slow down" for Yellow
• "go" for Green

This exercise introduces:

• Defining enums in Rust
• Matching on enum variants
• Returning string slices with a 'static lifetime (&'static str means the string is stored in the binary for the program’s entire lifetime — similar to how Python string literals live for the duration of the program)

🧠 Tip: use the match expression to handle each enum variant explicitly. Rust will even warn you if you forget to handle one!