HashMap Basic

Create and use hash maps for key-value storage.

Difficulty

Beginner

Code

use std::collections::HashMap;

fn main() {
    let mut scores: HashMap<String, i32> = HashMap::new();
    scores.insert(String::from("Alice"), 10);
    scores.insert(String::from("Bob"), 20);
    scores.insert(String::from("Charlie"), 30);

    for (name, score) in &scores {
        println!("{}: {}", name, score);
    }

    let alice = scores.get("Alice");
    println!("Alice: {:?}", alice);
}

Explanation

This example demonstrates how to use hashmap basic in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

Browse more examples in the collections category to build a complete understanding of this topic.