[Solved] Stacking Map Styles (Google Maps API)

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// create a variable for the element you want an option for
var styleOptionCityLabels = {
  featureType: 'administrative',
  elementType: 'labels',
  stylers: [{'visibility': 'on'}]
};

// create a variable for your map styles that pulls any option variables you have
var mapStyle = [styleOptionCityLabels];

  // get the checkbox element you want to control your toggle
  var cityCheck = $('#city-labels-checkbox');

  // apply a click listener to the box
  cityCheck.on('click', function(){

    // check if the box is checked
    if ($(cityCheck).is(':checked')) {

     // change the desired style
     styleOptionCityLabels.stylers = [{'visibility': 'on'}];
    } else {

     // change the desired style
     styleOptionCityLabels.stylers = [{'visibility': 'off'}];
    }

    // call the setOptions method to reload the altered styles
    map.setOptions({styles: mapStyle}); 
  });

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solved Stacking Map Styles (Google Maps API)