How to use google.maps.event.trigger(map, 'resize')

Question

I am new to JS, and have found the answer to a previous question, which brought up a new question, which brought me here again.

I have a Reveal Modal that contains a

Answer 1

google.maps.event.addListenerOnce(map, 'tilesloaded', function() {
                google.maps.event.addListenerOnce(map, 'tilesloaded', function() {
                    google.maps.event.trigger(map, 'resize');
                });
});