[O] Cache assignment types

src/logic/course.ts

@@ -222,10 +222,14 @@ export default class Course
         return this._cacheNumericGrade;
     }
 
+    private _cacheAssignmentTypes: AssignmentType[];
+
     /**
      * Get assignment types
      */
     get assignmentTypes(): AssignmentType[]
+    {
+        if (this._cacheAssignmentTypes == null)
         {
             // Get all types
             let types = this.assignments.map(a => a.type);
@@ -237,7 +241,7 @@ export default class Course
             let totalScoreMax = this.assignments.reduce((sum, a) => sum + a.scoreMax, 0);
 
             // For every type...
-        return types.map(type =>
+            this._cacheAssignmentTypes = types.map(type =>
             {
                 // Get assignments of the type
                 let typeAssignments = this.assignments.filter(a => a.type == type);
@@ -254,4 +258,7 @@ export default class Course
                 return {name: type, id: typeAssignments[0].typeId, weight: weight, scoreMax: scoreMax, score: score}
             })
         }
+        
+        return this._cacheAssignmentTypes;
+    }
 }