How to use async streams

Use the await keyword on async functions to pause execution until a result is ready, or chain calls to process data sequentially.

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())
}

This pattern fetches data from a URL and extracts the HTML title without blocking the main thread.

Async streams let your program start a task like downloading a file and then do other work while waiting for it to finish. Instead of freezing your app, it pauses the specific task and picks it back up the moment the data arrives. Think of it like ordering coffee: you place the order and wait at the counter for your name to be called, rather than standing in the kitchen watching the barista.