Use new util function to create array

src/components/AssignmentCard.js

@@ -110,6 +110,7 @@ function AssignmentCard({ title, classrooms, dueDate, scores, layoutType }) {
                 .filter((_, i) => i > 0)
                 .map(c => (
                   <div
+                    key={c.id}
                     style={{
                       position: 'absolute',
                       width: '100%',

src/screens/Home/View.js

@@ -95,11 +95,9 @@ function View({ layoutType, classrooms, assignments }) {
             gap="30px"
           >
             {classrooms === null ? (
-              Array(6)
+              createArrayFrom1ToN(6).map(i => (
-                .fill()
-                .map((_, index) => (
                 <Skeleton
-                    key={index}
+                  key={i}
                   variant="rectangular"
                   width="100%"
                   height={245}
@@ -131,11 +129,9 @@ function View({ layoutType, classrooms, assignments }) {
             gap="30px"
           >
             {assignments === null ? (
-              Array(6)
+              createArrayFrom1ToN(6).map(i => (
-                .fill()
-                .map((_, index) => (
                 <Skeleton
-                    key={index}
+                  key={i}
                   variant="rectangular"
                   width="100%"
                   height={245}