Practice: Asynchronous Programming w/ Callback Functions

Directions

Abstracting Over XMLHttpRequest

1. Write a function logData that takes a URL string, makes a GET request to that URL and logs the response to the console. Test your function by making a call to the JSON Placeholder API

2. The above function is only able to log the AJAX call's response to the console. Let's make a function that is more flexible. Write a function called get that takes a URL string and a callback function as arguments. This function makes a GET request to the passed URL and then invokes the given callback function on the response. Once again, test your function by making a call to the JSON Placeholder API.

3. Test the above function with an incorrect endpoint ('https://jsonplaceholder.typicode.com/postszz'). Since this request results in a 404 response, our function does not give us much helpful information back. Add a condition that checks for a response status of 404. For such responses, you should log, "404: Resource not found."

4. Let's get some practice using APIs that require a key. We will use Open Weather Map. To use this API, you must sign up for an account to receive an API Key. Please sign up here.

5. Test out your above functions using the Open Weather API.