Rust: How do you work withHashMap in Rust?

1use std::collections::HashMap;
2
3let mut scores = HashMap::new();
4scores.insert("Blue", 10);
5scores.insert("Red", 50);
6
7let score = scores.get("Blue").copied().unwrap_or(0);

1// Overwrite
2scores.insert("Blue", 25);
3
4// Entry API
5scores.entry("Yellow").or_insert(50);
6scores.entry("Blue").and_modify(|e| *e += 5).or_insert(0);

1for (key, value) in &scores {
2    println!("{}: {}", key, value);
3}