Use top-level for-await in various places (#3217)

3 files changed, 48 insertions, 55 deletions

diff --git a/std/examples/curl.ts b/std/examples/curl.ts
index e020016f8..b62e58b27 100644
--- a/std/examples/curl.ts
+++ b/std/examples/curl.ts
@@ -1,4 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-const url = Deno.args[1];
-const res = await fetch(url);
+const url_ = Deno.args[1];
+const res = await fetch(url_);
 await Deno.copy(Deno.stdout, res.body);
diff --git a/std/examples/echo_server.ts b/std/examples/echo_server.ts
index 3bed1bca2..1eafae50c 100644
--- a/std/examples/echo_server.ts
+++ b/std/examples/echo_server.ts
@@ -3,7 +3,6 @@ const hostname = "0.0.0.0";
 const port = 8080;
 const listener = Deno.listen({ hostname, port });
 console.log(`Listening on ${hostname}:${port}`);
-while (true) {
-  const conn = await listener.accept();
+for await (const conn of listener) {
   Deno.copy(conn, conn);
 }
diff --git a/std/examples/gist.ts b/std/examples/gist.ts
index 890d85099..d0e369c66 100755
--- a/std/examples/gist.ts
+++ b/std/examples/gist.ts
@@ -1,7 +1,5 @@
 #!/usr/bin/env -S deno --allow-net --allow-env
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-
-const { args, env, exit, readFile } = Deno;
 import { parse } from "https://deno.land/std/flags/mod.ts";
 
 function pathBase(p: string): string {
@@ -9,57 +7,53 @@ function pathBase(p: string): string {
   return parts[parts.length - 1];
 }
 
-async function main(): Promise<void> {
-  const token = env()["GIST_TOKEN"];
-  if (!token) {
-    console.error("GIST_TOKEN environmental variable not set.");
-    console.error("Get a token here: https://github.com/settings/tokens");
-    exit(1);
-  }
-
-  const parsedArgs = parse(args.slice(1));
-
-  if (parsedArgs._.length === 0) {
-    console.error(
-      "Usage: gist.ts --allow-env --allow-net [-t|--title Example] some_file " +
-        "[next_file]"
-    );
-    exit(1);
-  }
-
-  const files = {};
-  for (const filename of parsedArgs._) {
-    const base = pathBase(filename);
-    const content = await readFile(filename);
-    const contentStr = new TextDecoder().decode(content);
-    files[base] = { content: contentStr };
-  }
+const token = Deno.env()["GIST_TOKEN"];
+if (!token) {
+  console.error("GIST_TOKEN environmental variable not set.");
+  console.error("Get a token here: https://github.com/settings/tokens");
+  Deno.exit(1);
+}
 
-  const content = {
-    description: parsedArgs.title || parsedArgs.t || "Example",
-    public: false,
-    files: files
-  };
-  const body = JSON.stringify(content);
+const parsedArgs = parse(Deno.args.slice(1));
 
-  const res = await fetch("https://api.github.com/gists", {
-    method: "POST",
-    headers: [
-      ["Content-Type", "application/json"],
-      ["User-Agent", "Deno-Gist"],
-      ["Authorization", `token ${token}`]
-    ],
-    body
-  });
+if (parsedArgs._.length === 0) {
+  console.error(
+    "Usage: gist.ts --allow-env --allow-net [-t|--title Example] some_file " +
+      "[next_file]"
+  );
+  Deno.exit(1);
+}
 
-  if (res.ok) {
-    const resObj = await res.json();
-    console.log("Success");
-    console.log(resObj["html_url"]);
-  } else {
-    const err = await res.text();
-    console.error("Failure to POST", err);
-  }
+const files = {};
+for (const filename of parsedArgs._) {
+  const base = pathBase(filename);
+  const content = await Deno.readFile(filename);
+  const contentStr = new TextDecoder().decode(content);
+  files[base] = { content: contentStr };
 }
 
-main();
+const content = {
+  description: parsedArgs.title || parsedArgs.t || "Example",
+  public: false,
+  files: files
+};
+const body = JSON.stringify(content);
+
+const res = await fetch("https://api.github.com/gists", {
+  method: "POST",
+  headers: [
+    ["Content-Type", "application/json"],
+    ["User-Agent", "Deno-Gist"],
+    ["Authorization", `token ${token}`]
+  ],
+  body
+});
+
+if (res.ok) {
+  const resObj = await res.json();
+  console.log("Success");
+  console.log(resObj["html_url"]);
+} else {
+  const err = await res.text();
+  console.error("Failure to POST", err);
+}