get client's zip code (first five)

get-zip-code.js

window.navigator.geolocation.getCurrentPosition(function(pos){
  $.get('//maps.googleapis.com/maps/api/geocode/json?latlng='+pos.coords.latitude+','+pos.coords.longitude+'&sensor=true')
  .then(function(res){
    var postalCode = res.results.filter(function (result) {
      return result.types.indexOf('postal_code') !== -1;
    })[0];

    var formattedPostalCode = postalCode.address_components.filter(function(component) {
      return component.types.indexOf('postal_code') !== -1;
    }).map(function(postalCode) {
      return postalCode.long_name;
    })[0];

    return formattedPostalCode;
  });
});