Completed wesbos#4 added years lived in total

Author: sagun-mac

04 - Array Cardio Day 1/index-START.html

@@ -93,7 +93,10 @@
 
       // Array.prototype.reduce()
       // 4. How many years did all the inventors live all together?
-
+      const totalYear = inventors.reduce((pre, cur) => {
+        return pre + (cur.passed - cur.year);
+      }, 0);
+      console.log(totalYear);
       // 5. Sort the inventors by years lived
 
       // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name