Update Exercises Directory Names to Reflect Order

exercises/08_enums/enums3.rs

@@ -0,0 +1,73 @@
+// enums3.rs
+//
+// Address all the TODOs to make the tests pass!
+//
+// Execute `rustlings hint enums3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+enum Message {
+    // TODO: implement the message variant types based on their usage below
+}
+
+struct Point {
+    x: u8,
+    y: u8,
+}
+
+struct State {
+    color: (u8, u8, u8),
+    position: Point,
+    quit: bool,
+    message: String,
+}
+
+impl State {
+    fn change_color(&mut self, color: (u8, u8, u8)) {
+        self.color = color;
+    }
+
+    fn quit(&mut self) {
+        self.quit = true;
+    }
+
+    fn echo(&mut self, s: String) {
+        self.message = s
+    }
+
+    fn move_position(&mut self, p: Point) {
+        self.position = p;
+    }
+
+    fn process(&mut self, message: Message) {
+        // TODO: create a match expression to process the different message variants
+        // Remember: When passing a tuple as a function argument, you'll need extra parentheses:
+        // fn function((t, u, p, l, e))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_match_message_call() {
+        let mut state = State {
+            quit: false,
+            position: Point { x: 0, y: 0 },
+            color: (0, 0, 0),
+            message: "hello world".to_string(),
+        };
+        state.process(Message::ChangeColor(255, 0, 255));
+        state.process(Message::Echo(String::from("Hello world!")));
+        state.process(Message::Move(Point { x: 10, y: 15 }));
+        state.process(Message::Quit);
+
+        assert_eq!(state.color, (255, 0, 255));
+        assert_eq!(state.position.x, 10);
+        assert_eq!(state.position.y, 15);
+        assert_eq!(state.quit, true);
+        assert_eq!(state.message, "Hello world!");
+    }
+}