HOW to implement this method with a promise

How would I use a promise to wait for the asynchronous geocode method to return a result and then return either true or false?

function LocationValidator(value, element, paras) {
var geocoder = new google.maps.Geocoder();

geocoder.geocode({ 'address': value }, function (results, status) { // called asynchronously
    if (status == google.maps.GeocoderStatus.OK) {
        return true;
    } else {
        return false;
    }
});
}