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Diffstat (limited to 'rustlings/exercises/08_enums')
| -rw-r--r-- | rustlings/exercises/08_enums/README.md | 10 | ||||
| -rw-r--r-- | rustlings/exercises/08_enums/enums1.rs | 12 | ||||
| -rw-r--r-- | rustlings/exercises/08_enums/enums2.rs | 33 | ||||
| -rw-r--r-- | rustlings/exercises/08_enums/enums3.rs | 88 |
4 files changed, 143 insertions, 0 deletions
diff --git a/rustlings/exercises/08_enums/README.md b/rustlings/exercises/08_enums/README.md new file mode 100644 index 0000000..b05cb42 --- /dev/null +++ b/rustlings/exercises/08_enums/README.md @@ -0,0 +1,10 @@ +# 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 new file mode 100644 index 0000000..c0d0c30 --- /dev/null +++ b/rustlings/exercises/08_enums/enums1.rs @@ -0,0 +1,12 @@ +#[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 index 0000000..d70f639 --- /dev/null +++ b/rustlings/exercises/08_enums/enums2.rs @@ -0,0 +1,33 @@ +#[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 new file mode 100644 index 0000000..cb05f65 --- /dev/null +++ b/rustlings/exercises/08_enums/enums3.rs @@ -0,0 +1,88 @@ +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); + } +} |