3 files changed, 38 insertions, 48 deletions

diff --git a/exercises/12_options/options1.rs b/exercises/12_options/options1.rs
index e131b48..9964807 100644
--- a/exercises/12_options/options1.rs
+++ b/exercises/12_options/options1.rs
@@ -1,19 +1,13 @@
-// 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 :(
-fn maybe_icecream(time_of_day: u16) -> Option<u16> {
-    // 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.
-    // TODO: Complete the function body - remember to return an Option!
-    ???
+// If it's before 22:00 (24-hour system), then 5 scoops are left. At 22:00,
+// someone eats it all, so no icecream is left (value 0). Return `None` if
+// `hour_of_day` is higher than 23.
+fn maybe_icecream(hour_of_day: u16) -> Option<u16> {
+    // TODO: Complete the function body.
+}
+
+fn main() {
+    // You can optionally experiment here.
 }
 
 #[cfg(test)]
@@ -21,19 +15,22 @@ mod tests {
     use super::*;
 
     #[test]
+    fn raw_value() {
+        // TODO: Fix this test. How do you get the value contained in the
+        // Option?
+        let icecreams = maybe_icecream(12);
+
+        assert_eq!(icecreams, 5); // Don't change this line.
+    }
+
+    #[test]
     fn check_icecream() {
+        assert_eq!(maybe_icecream(0), Some(5));
         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(18), Some(5));
         assert_eq!(maybe_icecream(22), Some(0));
+        assert_eq!(maybe_icecream(23), Some(0));
+        assert_eq!(maybe_icecream(24), None);
         assert_eq!(maybe_icecream(25), None);
     }
-
-    #[test]
-    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);
-    }
 }
diff --git a/exercises/12_options/options2.rs b/exercises/12_options/options2.rs
index 4d998e7..07c27c6 100644
--- a/exercises/12_options/options2.rs
+++ b/exercises/12_options/options2.rs
@@ -1,9 +1,6 @@
-// options2.rs
-//
-// Execute `rustlings hint options2` or use the `hint` watch subcommand for a
-// hint.
-
-// I AM NOT DONE
+fn main() {
+    // You can optionally experiment here.
+}
 
 #[cfg(test)]
 mod tests {
@@ -12,7 +9,7 @@ mod tests {
         let target = "rustlings";
         let optional_target = Some(target);
 
-        // TODO: Make this an if let statement whose value is "Some" type
+        // TODO: Make this an if-let statement whose value is `Some`.
         word = optional_target {
             assert_eq!(word, target);
         }
@@ -23,15 +20,15 @@ mod tests {
         let range = 10;
         let mut optional_integers: Vec<Option<i8>> = vec![None];
 
-        for i in 1..(range + 1) {
+        for i in 1..=range {
             optional_integers.push(Some(i));
         }
 
         let mut cursor = range;
 
-        // TODO: make this a while let statement - remember that vector.pop also
-        // adds another layer of Option<T>. You can stack `Option<T>`s into
-        // while let and if let.
+        // TODO: Make this a while-let statement. Remember that `Vec::pop()`
+        // adds another layer of `Option`. You can do nested pattern matching
+        // in if-let and while-let statements.
         integer = optional_integers.pop() {
             assert_eq!(integer, cursor);
             cursor -= 1;
diff --git a/exercises/12_options/options3.rs b/exercises/12_options/options3.rs
index 23c15ea..4cedb51 100644
--- a/exercises/12_options/options3.rs
+++ b/exercises/12_options/options3.rs
@@ -1,21 +1,17 @@
-// options3.rs
-//
-// Execute `rustlings hint options3` or use the `hint` watch subcommand for a
-// hint.
-
-// I AM NOT DONE
-
+#[derive(Debug)]
 struct Point {
     x: i32,
     y: i32,
 }
 
 fn main() {
-    let y: Option<Point> = Some(Point { x: 100, y: 200 });
+    let optional_point = Some(Point { x: 100, y: 200 });
 
-    match y {
-        Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),
-        _ => panic!("no match!"),
+    // TODO: Fix the compiler error by adding something to this match statement.
+    match optional_point {
+        Some(p) => println!("Co-ordinates are {},{}", p.x, p.y),
+        _ => panic!("No match!"),
     }
-    y; // Fix without deleting this line.
+
+    println!("{optional_point:?}"); // Don't change this line.
 }