hash_map.rs

use std::collections::HashMap;

fn main(){
    let field_name = String::from("Favorite color");
    let field_value = String::from("Blue");
    let mut map = HashMap::new();
    map.insert(&field_name, field_value);
    
    let score = map.get(&field_name);
    match score {
        None => println!("None"),
        Some(x) => println!("Get value: {}", x),
    }
    
    for (key, value) in &map {
        println!("{}: {}", key, value);
    }
}