Mark set/jump as a clean architecture

src/content/repositories/MarkRepository.ts

@@ -0,0 +1,25 @@
+import Mark from '../domains/Mark';
+
+export default interface MarkRepository {
+  set(key: string, mark: Mark): void;
+
+  get(key: string): Mark | null;
+
+  // eslint-disable-next-line semi
+}
+
+const saved: {[key: string]: Mark} = {};
+
+export class MarkRepositoryImpl implements MarkRepository {
+  set(key: string, mark: Mark): void {
+    saved[key] = mark;
+  }
+
+  get(key: string): Mark | null {
+    let v = saved[key];
+    if (!v) {
+      return null;
+    }
+    return { ...v };
+  }
+}