Create data/grades.js

data/grades.js

@@ -0,0 +1,10 @@
+const grades = [
+    {assignmentName: 'assignment 01', studentName: 'Akira', score: 87},
+    {assignmentName: 'assignment 02', studentName: 'Betty', score: 81},
+    {assignmentName: 'assignment 03', studentName: 'Akira', score: 78},
+    {assignmentName: 'assignment 04', studentName: 'Betty', score: 92},
+    {assignmentName: 'assignment 05', studentName: 'Akira', score: 94},  
+    {assignmentName: 'assignment 06', studentName: 'Betty', score: 78} 
+]
+
+module.exports = { grades }

index.js

@@ -30,6 +30,8 @@
 
  */
 
+const { grades } = require("./data/grades")
+
  /**
 
     Looping using your preferred looping syntax and updating a shared variable
@@ -38,8 +40,19 @@
         Update `gradeTotal` so it increases value for each item in the array
 
  */
- const gradeTotal = 0
-
+ let gradeTotal = 0
+for(let i = 0; i < grades.length; i++) {
+    gradeTotal += grades[i].score
+}
+// from JR, for reference
+console.log({gradeTotal})
+gradeTotal = 0
+for (const i in grades) {
+    const { score } = grades[i]
+    console.log({score})
+    gradeTotal += score
+}
+console.log({gradeTotal})
 
  /**
 
@@ -50,4 +63,15 @@
         Replace `null` below with the use of `reduce`
 
   */
-  gradeTotal = null
+
+gradeTotal = grades.reduce(function (acumulator, item) {
+    return acumulator + item.score
+},0 )
+
+console.log({gradeTotal})
+
+gradeTotal = grades.reduce( (total, grade) => {
+    return total + grade.score
+}, 0 )
+
+console.log({gradeTotal})