rust-by-practice/solutions/collections/Hashmap.md

1.
```rust
// FILL in the blanks and FIX the erros
use std::collections::HashMap;
fn main() {
    let mut scores = HashMap::new();
    scores.insert("Sunface", 98);
    scores.insert("Daniel", 95);
    scores.insert("Ashley", 69);
    scores.insert("Katie", 58);

    // get returns a Option<&V>
    let score = scores.get("Sunface");
    assert_eq!(score, Some(&98));

    if scores.contains_key("Daniel") {
        // indexing return a value V
        let score = scores["Daniel"];
        assert_eq!(score, 95);
        scores.remove("Daniel");
    }

    assert_eq!(scores.len(), 3);

    for (name, score) in scores {
        println!("The score of {} is {}", name, score)
    }
}
```

2.
```rust
use std::collections::HashMap;
fn main() {
    let teams = [
        ("Chinese Team", 100),
        ("American Team", 10),
        ("France Team", 50),
    ];

    let mut teams_map1 = HashMap::new();
    for team in &teams {
        teams_map1.insert(team.0, team.1);
    }

    let teams_map2: HashMap<_,_> = teams.into_iter().collect();

    assert_eq!(teams_map1, teams_map2);

    println!("Success!")
}
```

```rust
use std::{collections::HashMap};
fn main() {
    let teams = [
        ("Chinese Team", 100),
        ("American Team", 10),
        ("France Team", 50),
    ];

    let mut teams_map1 = HashMap::new();
    for team in &teams {
        teams_map1.insert(team.0, team.1);
    }

    let teams_map2 = HashMap::from(teams);
    assert_eq!(teams_map1, teams_map2);

    println!("Success!")
}
```