@@ -583,11 +583,11 @@ Array..diff = function(comparisonArray) {
 const values = [];
 const hash = {};
 
-for (let i of comparisonArray) {
+for (const i of comparisonArray) {
 hash[i] = true;
 }
 
-for (let i of this) {
+for (const i of this) {
 if (!hash[i]) {
 values.push(i);
 }
@@ -608,11 +608,11 @@ class SuperArray extends Array {
 const values = [];
 const hash = {};
 
-for (let i of comparisonArray) {
+for (const i of comparisonArray) {
 hash[i] = true;
 }
 
-for (let i of this) {
+for (const i of this) {
 if (!hash[i]) {
 values.push(i);
 }
@@ -1150,12 +1150,12 @@ function renderLargeRectangles(rectangles) {
 rectangles.forEach((rectangle) => {
 rectangle.setWidth(4);
 rectangle.setHeight(5);
-let area = rectangle.getArea(); // BAD: Will return 25 for Square. Should be 20.
+const area = rectangle.getArea(); // BAD: Will return 25 for Square. Should be 20.
 rectangle.render(area);
 })
 }
 
-let rectangles = [new Rectangle(), new Rectangle(), new Square()];
+const rectangles = [new Rectangle(), new Rectangle(), new Square()];
 renderLargeRectangles(rectangles);
 ```
 
@@ -1932,7 +1932,7 @@ class PerformanceReview {
 }
 }
 
-let review = new PerformanceReview(user);
+const review = new PerformanceReview(user);
 review.perfReview();
 ```
 
@@ -1971,7 +1971,7 @@ class PerformanceReview {
 }
 }
 
-let review = new PerformanceReview(employee);
+const review = new PerformanceReview(employee);
 review.perfReview();
 ```
 
@@ -2072,7 +2072,7 @@ proper indentation and formatting give the visual structure to your code.
 ////////////////////////////////////////////////////////////////////////////////
 // Scope Model Instantiation
 ////////////////////////////////////////////////////////////////////////////////
-const $scope.model = {
+$scope.model = {
 menu: 'foo',
 nav: 'bar'
 };
@@ -2087,7 +2087,7 @@ const actions = function() {
 
 **Good**:
 ```javascript
-const $scope.model = {
+$scope.model = {
 menu: 'foo',
 nav: 'bar'
 };