-
Notifications
You must be signed in to change notification settings - Fork 10.1k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
5 changed files
with
187 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,7 @@ | ||
### Enums | ||
|
||
Rust allows you to define a type called `enums` which allow you to enumerate possible values. In combination with enums, we have the concept of `pattern matching` in Rust, which makes it easy to run different code for different values of an enumeration. Enums, while available in many languages, Rust's enums are most similar to `algebraic data types` in functional languages, such as F#, OCaml, and Haskell. | ||
|
||
#### Book Sections | ||
|
||
- [Enums](https://doc.rust-lang.org/book/ch06-00-enums.html) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,42 @@ | ||
// enums1.rs | ||
// Make me compile! Scroll down for hints! | ||
|
||
#[derive(Debug)] | ||
enum Message { | ||
// TODO: define a few types of messages as used below | ||
} | ||
|
||
fn main() { | ||
println!("{:?}", Message::Quit); | ||
println!("{:?}", Message::Echo); | ||
println!("{:?}", Message::Move); | ||
println!("{:?}", Message::ChangeColor); | ||
} | ||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
// Hint: The declaration of the enumeration type has not been defined yet. |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,61 @@ | ||
// enums2.rs | ||
// Make me compile! Scroll down for hints | ||
|
||
#[derive(Debug)] | ||
enum Message { | ||
// TODO: define the different variants used below | ||
} | ||
|
||
impl Message { | ||
fn call(&self) { | ||
println!("{:?}", &self); | ||
} | ||
} | ||
|
||
fn main() { | ||
let messages = [ | ||
Message::Move{ x: 10, y: 30 }, | ||
Message::Echo(String::from("hello world")), | ||
Message::ChangeColor(200, 255, 255), | ||
Message::Quit | ||
]; | ||
|
||
for message in &messages { | ||
message.call(); | ||
} | ||
} | ||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
// Hint: you can create enumerations that have different variants with different types | ||
// such as no data, anonymous structs, a single string, tuples, ...etc |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,63 @@ | ||
// enums3.rs | ||
// Address all the TODOs to make the tests pass! | ||
|
||
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 | ||
} | ||
|
||
impl State { | ||
fn change_color(&mut self, color: (u8, u8, u8)) { | ||
self.color = color; | ||
} | ||
|
||
fn quit(&mut self) { | ||
self.quit = true; | ||
} | ||
|
||
fn echo(&self, s: String) { | ||
println!("{}", 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 | ||
} | ||
} | ||
|
||
#[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) | ||
}; | ||
state.process(Message::ChangeColor(255, 0, 255)); | ||
state.process(Message::Echo(String::from("hello world"))); | ||
state.process(Message::Move{ 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); | ||
} | ||
|
||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters