Async Basic

Introduction to async/await in Rust with futures.

Difficulty

Advanced

Code

use std::time::Duration;

async fn fetch_data(id: u32) -> String {
    // simulate async work
    tokio::time::sleep(Duration::from_millis(100)).await;
    format!("data for id {}", id)
}

#[tokio::main]
async fn main() {
    let result = fetch_data(42).await;
    println!("{}", result);

    // concurrent futures
    let (a, b) = tokio::join!(fetch_data(1), fetch_data(2));
    println!("{}, {}", a, b);
}

Explanation

This example demonstrates how to use async 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 async category to build a complete understanding of this topic.