Few questions regarding this step

Hi Raul

First question, Your code will not work, there are very small differences to how you call an event handler and the use of this.

Here are 4 examples that look the same but this and the event are very different.

Run this code in your browser and check out the results:

// Number One
$('#begin-game').on('click', 'button', ( e ) => {
    console.log( $(this) );
    console.log( e );
    $(this).addClass("hide");
});

//Number Two
$('#begin-game-2').on('click', 'button', function( e ) {
    console.log( $(this) );
    console.log( e );
    $(this).addClass("hide");
});

//Number Three
$('#begin-game-3').on('click', function( e ) {
    console.log( $(this) );
    console.log( e );
    $(this).addClass("hide");    
});

//Number Four
(function( $ ) {

    var bindEvent = function() {
        $('#begin-game-4').on('click', _beginGame);
    };

    var _beginGame = function( e ) {
        console.log( $(this) );
        console.log( e );
        $(this).addClass("hide");    
    };

    bindEvent();

})( jQuery );

    <div id="begin-game">
        <button>Click me</button>
    </div>

    <div id="begin-game-2">
        <button>Click me 2</button>
    </div>

    <div id="begin-game-3">
        <button>Click me 3</button>
    </div>

    <div id="begin-game-4">
        <button>Click me 4</button>
    </div>

The first one is your code and you will see that "this" returns the window object, therefore, does not work as you expect.

The second one is exactly the same but uses a function rather than an arrow function, this does work as intended.

The third one is the same as the second with the id on the button instead of the outer div.

The Fourth one uses a module pattern with binding. This does work but again works slightly differently to the other examples that you will see in the console.

Run these four examples and see the minor differences and then I recommend reading a couple of the following articles which explain this very well.

this keyword

understanding this

design patterns

Hope this helps!