Inside of the getWeather function in app.js, we now need to use if-else statements in order to print the appropriate thing to the screen, depending on whether or not the error message exists. If there is errorMessage we do want to go ahead and print it using console.log. In this case we'll pass in the errorMessage variable:

weather.getWeather(39.9396284, -75.18663959999999, (errorMessage, weatherResults) => {
  if (errorMessage) {
    console.log(errorMessage);
  }
});

Now if there is no error message we'll use the weatherResults object. We'll be printing a nice formatted message later. For now we can simply print the weatherResults object using the pretty printing technique we talked about in the previous chapter, where we call JSON.stringify inside of console.log:

weather.getWeather(39.9396284, -75.18663959999999, (errorMessage, weatherResults) => {
  if (errorMessage) {
    console.log(errorMessage);
  } else {
    console.log(JSON.stringify());
  }
});

Inside the JSON.stringify parentheses, we'll provide those three arguments, the actual object; weatherResults, undefined for our filtering function, and a number for our indentation. In this case we'll go with 2 once again:

weather.getWeather(39.9396284, -75.18663959999999, (errorMessage, weatherResults) => {
  if (errorMessage) {
    console.log(errorMessage);
  } else {
    console.log(JSON.stringify(weatherResults, undefined, 2));
  }
});

And now that we have our getWeather call getting called with all three arguments, we can go ahead and actually implement this call inside of weather.js.