code.js

var geocoder = require('geocoder');
var Promise = require('bluebird');

function query(location) {
	console.log("Geocoding: %s", location);
	
	var locator = Promise.defer();
	geocoder.geocode(location, function(err, data) {
		if (err !== null || data.results === undefined || data.results.length < 1) {
			console.log("%s results: false", location);
			console.log("-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --");
			return;
		}
		var rsp = data.results[0];
		locator.resolve(rsp);
// 		console.log("formatted address: %s", rsp.formatted_address);
// 		console.log("-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --");
	});
	return locator.promise;
};

function pr(rsp) {
	console.log('Geocode response:', rsp);
};

/*
query('New York, NY').then(pr);
query('11217').then(pr);
query('66666').then(pr);
query('6666').then(pr);
query('London, UK').then(pr);
*/

['New York', '11217', '66666', '6666', 'London'].reduce(function(seq, loc) {
	return seq.then(function() {
		return query(loc).then(pr);
	});

}, new Promise()).then(function() { console.log('done') });