02_advanced/uebungen/u14_avg-scores/index.html

@@ -44,6 +44,43 @@
         ['Clara', 76, 95, 89, 91],
         ['David', 82, 79, 91, 85],
       ];
+
+      const calculateAvgGrades = () => {
+        const averages = [];
+
+        for (let row = 1; row < gradesTable.length; row++) {
+          let sum = 0;
+
+          for (let column = 1; column < gradesTable[row].length; column++) {
+            sum += gradesTable[row][column];
+          }
+
+          const numberOfSubjects = gradesTable[row].length - 1;
+          averages.push(Number((sum / numberOfSubjects).toFixed(2)));
+        }
+
+        return averages;
+      };
+
+      const calculateAvgSubjects = () => {
+        const averages = [];
+
+        for (let column = 1; column < gradesTable[0].length; column++) {
+          let sum = 0;
+
+          for (let row = 1; row < gradesTable.length; row++) {
+            sum += gradesTable[row][column];
+          }
+
+          const numberOfStudents = gradesTable.length - 1;
+          averages.push(Number((sum / numberOfStudents).toFixed(2)));
+        }
+
+        return averages;
+      };
+
+      console.log(calculateAvgGrades()); // => [85.75, 85.25, 87.75, 84.25]
+      console.log(calculateAvgSubjects()); // => [83.25, 88.5, 85.5, 85.75]
     </script>
   </body>
 </html>