Rust

A JavaScript Hacker's Cheatsheet Guide to Rust

While Mark is porting his database to Rust, all he wanted to know was how to do this javascript in Rust.

var Groceries = {
  add_milk: function(obj){
    obj.milk = "1gallon whole";
  }
}

var obj = {};
Groceries.add_milk(obj);
console.log(obj.milk);

Here's how: (try it on the online Rust playground)

use std::collections::HashMap;

type Object<'a> = HashMap<&'a str, Value<'a>>;
#[derive(Debug)]
enum Value<'a>{
    Null(Option<bool>),
    Bit(bool),
    Number(f32),
    Text(&'a str),
    Link(Object<'a>)
}

struct Groceries;
impl Groceries {
    fn add_milk(obj: &mut Object) {
        obj.insert("milk", Value::Text("1gallon whole"));
    }
}

fn main() {
    let mut obj = Object::new();
    Groceries::add_milk(&mut obj);
    println!("{:?}", obj.get("milk"));
}