[+] Encapsulate getAllGradingPeriods()

src/logic/course.ts

@@ -190,6 +190,17 @@ export default class Course
         })
     }
 
+    /**
+     * Get currently selected grading periods
+     */
+    get allGradingPeriods(): number[]
+    {
+        return this.cache.get('AllGradingPeriods', () =>
+        {
+            return [0, 1, 2, 3].filter(term => this.termAssignments[term].filter(a => a.graded).length != 0);
+        })
+    }
+
     /**
      * Get assignments of the selected grading periods
      */