diff --git a/exercises/options/options1.rs b/exercises/options/options1.rs index 1149af08..64f7bd7b 100644 --- a/exercises/options/options1.rs +++ b/exercises/options/options1.rs @@ -1,8 +1,6 @@ // options1.rs // Execute `rustlings hint options1` or use the `hint` watch subcommand for a hint. -// I AM NOT DONE - // 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 :( @@ -10,7 +8,15 @@ 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. - ??? + let ice_cream_count = if time_of_day < 22 { + Some(5) + } else if time_of_day < 24 { + Some(0) + } else { + None + }; + + ice_cream_count } #[cfg(test)] @@ -30,6 +36,6 @@ mod tests { fn raw_value() { // TODO: Fix this test. How do you get at the value contained in the Option? let icecreams = maybe_icecream(12); - assert_eq!(icecreams, 5); + assert_eq!(icecreams, Some(5)); } } diff --git a/exercises/options/options2.rs b/exercises/options/options2.rs index b1120471..7d2fcaa6 100644 --- a/exercises/options/options2.rs +++ b/exercises/options/options2.rs @@ -1,8 +1,6 @@ // options2.rs // Execute `rustlings hint options2` or use the `hint` watch subcommand for a hint. -// I AM NOT DONE - #[cfg(test)] mod tests { use super::*; @@ -13,8 +11,8 @@ mod tests { let optional_target = Some(target); // TODO: Make this an if let statement whose value is "Some" type - word = optional_target { - assert_eq!(word, target); + if let word = optional_target { + assert_eq!(word, Some(target)); } } @@ -28,8 +26,8 @@ mod tests { // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option // You can stack `Option`'s into while let and if let - integer = optional_integers.pop() { - assert_eq!(integer, range); + while let Some(integer) = optional_integers.pop() { + assert_eq!(integer, Some(range)); range -= 1; } } diff --git a/exercises/options/options3.rs b/exercises/options/options3.rs index 3f995c52..1dd0b374 100644 --- a/exercises/options/options3.rs +++ b/exercises/options/options3.rs @@ -1,8 +1,6 @@ // options3.rs // Execute `rustlings hint options3` or use the `hint` watch subcommand for a hint. -// I AM NOT DONE - struct Point { x: i32, y: i32, @@ -12,7 +10,7 @@ fn main() { let y: Option = Some(Point { x: 100, y: 200 }); match y { - Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y), + Some(ref p) => println!("Co-ordinates are {},{} ", p.x, p.y), _ => println!("no match"), } y; // Fix without deleting this line.