Learn TypeScript 3 by Building Web Applications

Implementing the MediaManController class

Go ahead and add the skeleton of the controller implementation:

class MediaManControllerImpl implements MediaManController { 
    private readonly _view: MediaManView; // <1> 
    private readonly _bookService: MediaService<Book>; // <2> 
    private readonly _movieService: MediaService<Movie>; 
 
    private _bookCollections: Map<string, MediaCollection<Book>> =     new Map<string, MediaCollection<Book>>(); // <3> 
    private _movieCollections: Map<string, MediaCollection<Movie>> =     new Map<string, MediaCollection<Movie>>(); 
 
    constructor(view: MediaManView, bookService: MediaService<Book>,  movieService: MediaService<Movie>) { if (!view) { throw new Error("The view is mandatory!"); } if (!bookService) { throw new Error("The book ...