[Rust] Iterating a map with its keys.

use std::collections::HashMap;

fn main() {
    let mut hash = HashMap::new();

    hash.insert("one", "eins");
    hash.insert("two", "zwei");
    hash.insert("three", "drei");

    // Iterate the hash by key
    for k in hash.keys() {
        println!("{} => {}", k, *hash.get(k).unwrap());
    }
}