tallying string times with reduce complete

Author: lindsma

18 - Adding Up Times with Reduce/index-START.html

@@ -181,7 +181,6 @@
       Video 58
     </li>
 
-<script>
-</script>
+<script src='js/app.js'></script>
 </body>
 </html>

18 - Adding Up Times with Reduce/js/app.js

@@ -0,0 +1,15 @@
+const timeNodes = Array.from(document.querySelectorAll('[data-time]'));
+const seconds = timeNodes
+.map(node => node.dataset.time)
+.map(timeCode => {
+  const [mins, secs] = timeCode.split(':').map(parseFloat);
+  return mins * 60 + secs;
+})
+.reduce((total, vidSeconds) => total + vidSeconds);
+
+let secondsLeft = seconds;
+const hours = Math.floor(secondsLeft / 3600);
+secondsLeft = secondsLeft % 3600;
+const mins = Math.floor(secondsLeft / 60);
+secondsLeft = secondsLeft % 60;
+console.log(hours, mins, secondsLeft);