About the function which is called automatically, it's a common pattern in javascript. It's used to create a new namespace/modules as block are defined per func

About the function which is called automatically, it's a common pattern in javascript. It's used to create a new namespace/modules as block are defined per function instead of {}. And, you are right that we're not assigning the return value of $.getJSON. Basically, once $.getJSON has finished with the request, it will call a function with the result. This result is set to the variable passed to defer. It's a bit of a brain teaser but that's the whole point of the await/defer thingy. Instead of using a callback to retrieve the result as an argument, you just write a variable after defer and you receive it.