in this challenge we have to add an event listener
(keydown) in the
componentDidMount() and then remove it in the
componentWillUnmount() after that if i keep the
enter button down i see a message on screen. So i added the event listener successfully , but i dont understand what i did there with the remove event listener, i mean, how is it removed and when? cause i can still press the enter key in my keyboard and the message still appear on my screen.