Rust Programming Tutorials, Guides & Best Practices

use std::collections::HashMap;

let mut scores = HashMap::new();
scores.insert(String::from("Blue"), 10);
scores.insert(String::from("Yellow"), 50);

for i in &v {
    println!("{}", i);
}

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

• A Future represents a computation that will eventually produce a value.
• Rust’s Future is lazy, meaning it won’t do anything until it’s awaited.

Rust’s async ecosystem includes powerful libraries like tokio and async-std that provide runtime support for async operations. These libraries offer utilities for managing tasks, handling I/O, and more, making it easier to build concurrent applications.