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Rust 101
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let s = String::from("Hello World!"); | |
// move == transfering ownership | |
let t = s; | |
// mutability of data can be changed when ownership is transferred | |
let mut u = s; | |
let mut first_name = String::from("Oliver") | |
// creating a reference == borrowing | |
fn own(s: &String) { | |
println!("{}", s); | |
} | |
fn append_last_name(s: &mut String) { | |
s.push_str(" Weiler"); | |
} | |
// ! An immutable references' scope ends the last time it is used | |
let me = String::from("Oliver Weiler"); | |
let also_me = &me; | |
// scope of also_me ends here | |
println!("{}", also_me); | |
// a slice | |
let oliver: &s = &me[..6]; | |
let weiler: &s = &me[6..]; | |
// string literals are slices | |
let oliver_weiler = "Oliver Weiler"; | |
// struct definition | |
struct Person { | |
first_name: String, | |
last_name: String, | |
age: u32, | |
} | |
// struct instantiation | |
let mut me = Person { | |
first_name: String::from("Oiver"), | |
last_name: String::from("Weiler"), | |
age: 41, | |
}; | |
me.first_name = String::from("Oliver") | |
let first_name = "Kathrin"; | |
let last_name = "Weiler"; | |
let age = 36; | |
// field init shorthand | |
let kathrin = Person { | |
first_name, | |
last_name, | |
age, | |
}; | |
// struct update | |
let clone = Person { | |
first_name = String::from("Kate"), | |
..kathrin | |
}; | |
// tuple structs | |
struct Point(i32, i32, i32); | |
struct Color(i32, i32, i32); | |
let p = Point(0, 0, 0); | |
let c = Color(255, 255, 255); | |
struct Rectangle { | |
width: u32, | |
height: u32, | |
} | |
// add area method | |
impl Rectangle { | |
fn area(&self) -> u32 { | |
self.width * self.height | |
} | |
} | |
let p = Person { | |
first_name: String::from("Oliver"), | |
last_name: String::from("Weiler"), | |
age: 41, | |
} | |
impl Person { | |
fn full_name(&self) -> String { | |
format!("{} {}", self.first_name, self.last_name) | |
} | |
// associated function | |
fn new_born(first_name: String, last_name: String) -> Person { | |
Person { | |
first_name, | |
last_name, | |
age: 0 | |
} | |
} | |
} | |
// automatic referencing | |
println!("{}", p.full_name()); | |
// equivalent to | |
println!("{}", &p.full_name()); | |
enum Message { | |
ChangeColor(u8, u8, u8), | |
Echo(String), | |
// anonymous struct | |
Move { x: i32, y: i32 }, | |
Quit | |
} | |
impl Message { | |
fn call(&self) { | |
println!("{:?}", &self); | |
} | |
} | |
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; | |
} | |
pub fn process(&mut self, message: Message) { | |
match message { | |
Message::ChangeColor(r, g, b) => self.change_color((r, g, b)), | |
Message::Echo(s) => self.echo(s), | |
Message::Move { x, y } => self.move_position(Point { x, y }), | |
Message::Quit => self.quit() | |
} | |
} | |
} |
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