Examples of some Rust Crates that mimic some common Python data structures

main.rs

use counter::Counter;
use defaultmap::DefaultHashMap;

fn counter_example() {
    let counter = "Hello, world!".chars().collect::<Counter<_>>();

    for (item, count) in counter.most_common() {
        println!("{}: {}", item, count);
    }
}

fn default_map_example() {
    let mut default_map: DefaultHashMap<&str, Vec<u32>> = DefaultHashMap::new(vec![]);

    for animal in ["dog", "cat", "mouse"] {
        for number in 0..10 {
            default_map[animal].push(number);
        }
    }

    for key in default_map.keys() {
        let value_string = default_map[key]
            .iter()
            .map(|a| a.to_string())
            .collect::<Vec<String>>()
            .join(", ");
        println!("{}: [{}]", key, value_string)
    }
}

fn main() {
    counter_example();
    default_map_example();
}