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class GameMaster {
    
    player.placeMarker()
    // Do other stuff here
}



class Player {
    placeMarker(squareIndex) {
        square.markerPlaced = squareIndex
    }
}


class Square {
    markerPlaced = null;
}


// index.html
<ul>
    <li class="square"></li>
    <li class="square"></li>
    <li class="square"></li>
    <li class="square"></li>
    <li class="square"></li>
</ul>
<script>
    const squares = document.querySelectorAll('.square')
    squares.forEeach(square => {
        square.addEventListener('click', getIndexOfSquare);
    })
</script>