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-rw-r--r--rustlings/exercises/08_enums/README.md10
-rw-r--r--rustlings/exercises/08_enums/enums1.rs12
-rw-r--r--rustlings/exercises/08_enums/enums2.rs33
-rw-r--r--rustlings/exercises/08_enums/enums3.rs88
4 files changed, 143 insertions, 0 deletions
diff --git a/rustlings/exercises/08_enums/README.md b/rustlings/exercises/08_enums/README.md
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+++ b/rustlings/exercises/08_enums/README.md
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+# Enums
+
+Rust allows you to define types called "enums" which enumerate possible values.
+Enums are a feature in many languages, but their capabilities differ in each language. Rust's enums are most similar to algebraic data types in functional languages, such as F#, OCaml, and Haskell.
+Useful in combination with enums is Rust's "pattern matching" facility, which makes it easy to run different code for different values of an enumeration.
+
+## Further information
+
+- [Enums](https://doc.rust-lang.org/book/ch06-00-enums.html)
+- [Pattern syntax](https://doc.rust-lang.org/book/ch19-03-pattern-syntax.html)
diff --git a/rustlings/exercises/08_enums/enums1.rs b/rustlings/exercises/08_enums/enums1.rs
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+#[derive(Debug)]
+enum Message {
+ // TODO: Define a few types of messages as used below.
+}
+
+fn main() {
+ println!("{:?}", Message::Resize);
+ println!("{:?}", Message::Move);
+ println!("{:?}", Message::Echo);
+ println!("{:?}", Message::ChangeColor);
+ println!("{:?}", Message::Quit);
+}
diff --git a/rustlings/exercises/08_enums/enums2.rs b/rustlings/exercises/08_enums/enums2.rs
new file mode 100644
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+++ b/rustlings/exercises/08_enums/enums2.rs
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+#[derive(Debug)]
+struct Point {
+ x: u64,
+ y: u64,
+}
+
+#[derive(Debug)]
+enum Message {
+ // TODO: Define the different variants used below.
+}
+
+impl Message {
+ fn call(&self) {
+ println!("{self:?}");
+ }
+}
+
+fn main() {
+ let messages = [
+ Message::Resize {
+ width: 10,
+ height: 30,
+ },
+ Message::Move(Point { x: 10, y: 15 }),
+ Message::Echo(String::from("hello world")),
+ Message::ChangeColor(200, 255, 255),
+ Message::Quit,
+ ];
+
+ for message in &messages {
+ message.call();
+ }
+}
diff --git a/rustlings/exercises/08_enums/enums3.rs b/rustlings/exercises/08_enums/enums3.rs
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+struct Point {
+ x: u64,
+ y: u64,
+}
+
+enum Message {
+ Resize { width: u64, height: u64 },
+ Move(Point),
+ Echo(String),
+ ChangeColor(u8, u8, u8),
+ Quit,
+}
+
+struct State {
+ width: u64,
+ height: u64,
+ position: Point,
+ message: String,
+ // RGB color composed of red, green and blue.
+ color: (u8, u8, u8),
+ quit: bool,
+}
+
+impl State {
+ fn resize(&mut self, width: u64, height: u64) {
+ self.width = width;
+ self.height = height;
+ }
+
+ fn move_position(&mut self, point: Point) {
+ self.position = point;
+ }
+
+ fn echo(&mut self, s: String) {
+ self.message = s;
+ }
+
+ fn change_color(&mut self, red: u8, green: u8, blue: u8) {
+ self.color = (red, green, blue);
+ }
+
+ fn quit(&mut self) {
+ self.quit = true;
+ }
+
+ fn process(&mut self, message: Message) {
+ // TODO: Create a match expression to process the different message
+ // variants using the methods defined above.
+ }
+}
+
+fn main() {
+ // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_match_message_call() {
+ let mut state = State {
+ width: 0,
+ height: 0,
+ position: Point { x: 0, y: 0 },
+ message: String::from("hello world"),
+ color: (0, 0, 0),
+ quit: false,
+ };
+
+ state.process(Message::Resize {
+ width: 10,
+ height: 30,
+ });
+ state.process(Message::Move(Point { x: 10, y: 15 }));
+ state.process(Message::Echo(String::from("Hello world!")));
+ state.process(Message::ChangeColor(255, 0, 255));
+ state.process(Message::Quit);
+
+ assert_eq!(state.width, 10);
+ assert_eq!(state.height, 30);
+ assert_eq!(state.position.x, 10);
+ assert_eq!(state.position.y, 15);
+ assert_eq!(state.message, "Hello world!");
+ assert_eq!(state.color, (255, 0, 255));
+ assert!(state.quit);
+ }
+}