class ScreenManager { constructor() { this.textbox; this.timer; this.screen; } draw() { this.screen.draw(); } setScreen(pScreen) { this.screen = pScreen; } getScreen() { return this.screen; } letterTyped(key) { let methods = Object.getOwnPropertyNames(Object.getPrototypeOf(this.screen)); for (let i = 0; i < methods.length; i++) { if (methods[i] === "letterTyped") { this.screen.letterTyped(key) } } } }