From 8d8a8b6f76195dd5ccc5858d69a76618ddf61baa Mon Sep 17 00:00:00 2001
From: Martin Geisler <mgeisler@google.com>
Date: Thu, 20 Jun 2024 00:29:42 +0200
Subject: [PATCH] Simplify `join_all` example

This keeps the original structure, but removes 7 lines of code.
---
 src/concurrency/async-control-flow/join.rs | 23 ++++++++--------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/src/concurrency/async-control-flow/join.rs b/src/concurrency/async-control-flow/join.rs
index 2fae1c87..1a5c2f27 100644
--- a/src/concurrency/async-control-flow/join.rs
+++ b/src/concurrency/async-control-flow/join.rs
@@ -1,24 +1,17 @@
-use anyhow::Result;
-use futures::future;
+use futures::future::join_all;
 use reqwest;
-use std::collections::HashMap;
 
-async fn size_of_page(url: &str) -> Result<usize> {
+async fn size_of_page(url: &str) -> reqwest::Result<usize> {
     let resp = reqwest::get(url).await?;
     Ok(resp.text().await?.len())
 }
 
 #[tokio::main]
 async fn main() {
-    let urls: [&str; 4] = [
-        "https://google.com",
-        "https://httpbin.org/ip",
-        "https://play.rust-lang.org/",
-        "BAD_URL",
-    ];
-    let futures_iter = urls.into_iter().map(size_of_page);
-    let results = future::join_all(futures_iter).await;
-    let page_sizes_dict: HashMap<&str, Result<usize>> =
-        urls.into_iter().zip(results.into_iter()).collect();
-    println!("{:?}", page_sizes_dict);
+    let urls = ["https://rust-lang.org", "https://httpbin.org/ip", "BAD_URL"];
+    let futures = urls.into_iter().map(size_of_page);
+    let results = join_all(futures).await;
+    for (url, result) in urls.into_iter().zip(results) {
+        println!("{url}: {result:?}");
+    }
 }