Quick Rust

Posted on September 2, 2022

Tags: codeetc

1 Cargo
2 Rust
3 vector, range loops

1 Cargo

cargo new helloworld
cargo run helloworld

2 Rust

Rust has no classes
Rust mainly uses struct (Product Types) and enum (Sum Types)
- impl are like pointer receivers in Golang
- impl lets struct have methods

pub struct LList {
    x : i32,
    next: Option<Box<LList >>
}

impl LList {
    fn get(&self) -> i32{
         return self.x;
    }
}


fn main() {
    let mut nodeA = LList{x :8, next: None};
    let nodeB = LList{x: 33, next: None};
    nodeA.next = Some(Box::new(nodeB));
    if let Some(i) = nodeA.next {
        println!("{:?}",i.get());    
    }
    
}

3 vector, range loops

let mut vec1 = vec![1,2,3];

// (1..10) is a range type
for i in (1..10){
    ..
}

convert range to vector. Why? because iter() doesnt work on range

let mut v3 :Vec<i32> = (1..10).collect();

//build a vector of tuples
let v4: Vec<(&i32,&i32)>= v3.iter().map(|x| (x,x)).collect();