refactored CartoDB layers switcher

Refactored creation of multiple CartoDB layers.

<!DOCTYPE html>
<html>
  <head>
    <title>MUG</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <link rel="shortcut icon" href="https://cartodb.com/assets/favicon.ico" />

#ky_oil_and_gas_wells {
           marker-fill-opacity: 0.9;
           marker-line-color: #FFF;
           marker-line-width: .2;
           marker-line-opacity: 1;
           marker-placement: point;
           marker-type: ellipse;
           marker-width: 3;
           marker-allow-overlap: true;
           [zoom > 9]{
               marker-width: 5;
           }
           [zoom > 9]{
               marker-width:7;
           }
           [zoom > 9]{
               marker-width:9;
           }
        }

#ky_oil_and_gas_wells[org_result="D&A"] {
           marker-fill: #a6cee3;
        }

#ky_oil_and_gas_wells[org_result="GAS"] {
           marker-fill: #FF5C00;
        }

#ky_oil_and_gas_wells[org_result="OIL"] {
           marker-fill: #850200;
        }
    </script>

var map = new L.Map("map", {
        center: [38.8369, -84.6847],
        zoom: 7
    });

L.tileLayer('https://tile.stamen.com/toner/{z}/{x}/{y}.png', {
        attribution: 'Stamen'
        }).addTo(map);

var dryAbandonedLayer = {
            user_name: 'rgdonohue',
            type: 'cartodb',
            sublayers: [{
                    sql: "SELECT * FROM ky_oil_and_gas_wells WHERE org_result='D&A'",
                    cartocss: $("#wells-styles").text()
                }]
        },
        gasLayer = {
            user_name: 'rgdonohue',
            type: 'cartodb',
            sublayers: [{
                    sql: "SELECT * FROM ky_oil_and_gas_wells WHERE org_result='GAS'",
                    cartocss: $("#wells-styles").text()
            }]
        },
        oilLayer = {
            user_name: 'rgdonohue',
            type: 'cartodb',
            sublayers: [{
                    sql: "SELECT * FROM ky_oil_and_gas_wells WHERE org_result='OIL'",
                    cartocss: $("#wells-styles").text()
            }]
        }

var layersSource = { dryAbandonedLayer:dryAbandonedLayer, gasLayer: gasLayer, oilLayer: oilLayer},
         layers = {};

for (l in layersSource) {
        createLayer(l)
     }

$("#layer-controls button").on('click', function(e) {

var currentLayer = $(e.target).attr('id');
        layers[currentLayer].toggle();

});

</script>

</body>
</html>

Modified http://libs.cartocdn.com/cartodb.js/v3/3.15/cartodb.js to a secure url

https://libs.cartocdn.com/cartodb.js/v3/3.15/cartodb.js