refine sound example

documentation/coffee/async.coffee

@@ -2,13 +2,13 @@ sleep = (ms) ->
   new Promise (resolve) ->
     window.setTimeout resolve, ms
 
-window.countdown = (seconds) ->
-  if not window.speechSynthesis?
-    alert('speech API not supported in your browser')
-    return
-
+countdown = (seconds) ->
   for i in [seconds..1]
-    utterance = new SpeechSynthesisUtterance("#{i}")
-    speechSynthesis.speak(utterance)
-    await sleep(1000)  # wait one second
-  alert "done!"
+    if window.speechSynthesis?
+      utterance = new SpeechSynthesisUtterance "#{i}"
+      window.speechSynthesis.speak utterance
+    console.log i
+    await sleep 1000 # wait one second
+  alert "Done! (Check the console!)"
+
+countdown(3)

documentation/index.html.js

@@ -868,7 +868,7 @@ Block
       may be used if you need to force a generator that doesn't yield.
     </p>
 
-    <%= codeFor('async', 'countdown(3)') %>
+    <%= codeFor('async', true) %>
     <p>
       Similar to how <code>yield return</code> forces a generator, <code>await return</code>
       may be used to force a function to be async.

documentation/js/async.js

@@ -0,0 +1,23 @@
+// Generated by CoffeeScript 2.0.0-alpha
+var countdown, sleep;
+
+sleep = function(ms) {
+  return new Promise(function(resolve) {
+    return window.setTimeout(resolve, ms);
+  });
+};
+
+countdown = async function(seconds) {
+  var i, j, ref, utterance;
+  for (i = j = ref = seconds; ref <= 1 ? j <= 1 : j >= 1; i = ref <= 1 ? ++j : --j) {
+    if (window.speechSynthesis != null) {
+      utterance = new SpeechSynthesisUtterance("" + i);
+      window.speechSynthesis.speak(utterance);
+    }
+    console.log(i);
+    await sleep(1000);
+  }
+  return alert("Done! (Check the console!)");
+};
+
+countdown(3);