Separating out functions

[ameliejyc]

There are a few places where you could abstract out parts of your functions into smaller functions.

This makes your code cleaner, easier to read and see where things live, easier to modify and easier to test.

So for example, your API url is being created in your XHR request. This could be abstracted out into a createAPIUrl function and then tested to make sure it's being built correctly every time.