Get User Postal Code ( Zip Code ) with Browser Geolocation & Google API

geolocation.js

// jQuery must be loaded before calling this function ( for AJAX )
let getUserPostcode = () => {
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(
            (position) => {
                let lat = position.coords.latitude,
                    long = position.coords.longitude,
                    url = "https://maps.googleapis.com/maps/api/geocode/json?latlng=" + lat + "," + long + "&key=YOUR_GOOGLE_API_KEY";
                $.ajax({
                    type: "GET",
                    url: url,
                    dataType: "json",
                    success: function (response) {
                        let results = response.results,
                            postalCode = '';
                        if (results[0]) {
                            for (let i = 0; i < results[0].address_components.length; i++) {
                                let types = results[0].address_components[i].types;

                                for (let typeIdx = 0; typeIdx < types.length; typeIdx++) {
                                    if (types[typeIdx] == 'postal_code') {
                                        postalCode = results[0].address_components[i].long_name;
                                        break;
                                    }
                                }
                                if (postalCode !== '') {
                                    break;
                                }
                            }
                        }
                        alert(postalCode);
                    },
                    error: function (req, status, error) {
                        alert('Sorry, there was an error.');
                    }
                });
            },
            (error) => {
                switch (error.code) {
                    case error.PERMISSION_DENIED:
                        alert("User denied the request for Geolocation.");
                        break;
                    case error.POSITION_UNAVAILABLE:
                        alert("Location information is unavailable.");
                        break;
                    case error.TIMEOUT:
                        alert("The request to get user location timed out.");
                        break;
                    case error.UNKNOWN_ERROR:
                        alert("An unknown error occurred.");
                        break;
                }
            }
        );
    } else {
        alert("Sorry, Geolocation is not supported by your browser.");
    }
}