How to Use async and await in Rust

Use the async keyword to define a function that returns a future and await to pause execution until an asynchronous operation completes.

use trpl::Html;

async fn page_title(url: &str) -> Option<String> {
    let response_text = trpl::get(url).await.text().await;
    Html::parse(&response_text)
        .select_first("title")
        .map(|title| title.inner_html())
}

In main, you must run this function using an async runtime like tokio or async-std because main cannot be async by default in standard Rust.

Async and await let your code wait for slow tasks, like downloading a webpage, without freezing the rest of your program. Think of it as ordering a coffee: you place the order (start the task) and wait at the counter (await) until it's ready, rather than staring at the machine the whole time. This keeps your application responsive while handling multiple tasks at once.