// options1.rs // Execute `rustlings hint options1` or use the `hint` watch subcommand for a hint. // This function returns how much icecream there is left in the fridge. // If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them // all, so there'll be no more left :( fn maybe_icecream(time_of_day: u16) -> Option { // We use the 24-hour system here, so 10PM is a value of 22 and 12AM is a value of 0 // The Option output should gracefully handle cases where time_of_day > 23. if time_of_day < 22 { Some(5) } else if time_of_day < 24 { Some(0) } else { None } } #[cfg(test)] mod tests { use super::*; #[test] fn check_icecream() { assert_eq!(maybe_icecream(9), Some(5)); assert_eq!(maybe_icecream(10), Some(5)); assert_eq!(maybe_icecream(23), Some(0)); assert_eq!(maybe_icecream(22), Some(0)); assert_eq!(maybe_icecream(25), None); } #[test] fn raw_value() { let icecreams = maybe_icecream(12); assert_eq!(icecreams, Some(5)); } }