Abstracting callbacks

In this section, we'll be refactoring app.js, taking a lot of the complex logic related to geocoding and moving it into a separate file. Currently, all of the logic for making the request and determining whether or not the request succeeded, our if else statements, live inside of app.js:

request({
  url: `https://maps.googleapis.com/maps/api/geocode/json?address=${encodedAddress}`,
  json: true
}, (error, response, body) => {
  if (error) {
    console.log('Unable to connect Google servers.');
  } else if (body.status === 'ZERO_RESULTS') {
   console.log('Unable to find that address.');
  } else if (body.status === 'OK') {
    console.log(`Address: ${body.results[0].formatted_address}`);
    console.log(`Latitude: ${body.results[0].geometry.location.lat}`);
    console.log(`Longitude: ${body.results[0].geometry.location.lng}`);
  }
});

This is not exactly reusable and it really doesn't belong here. What I'd like to do before we add even more logic related to fetching...