fix(book-static-service): add Array.push for the createBook method

Author: robinboehm

src/app/book/shared/book-static-async-data.service.ts

@@ -59,6 +59,7 @@ export class BookStaticAsyncDataService {
   }
 
   createBook(book): Observable<Book> {
+    this.staticBookData.push(book)
     return Observable.of(book);
   }
 

src/app/book/shared/book-static-data.service.ts

@@ -59,6 +59,7 @@ export class BookStaticDataService {
   }
 
   createBook(book): Book {
+    this.staticBookData.push(book)
     return book;
   }