Announced last week, the new app object is defined only in the context of a theme app extension or app proxy.
Shopify
There was a time when XMLHttpRequest was used to make API requests. It didn’t include Promises, and it didn’t make for clean JavaScript code. Using jQuery, you could use the cleaner syntax of jQuery.ajax().
Now, JavaScript has its own built-in way to make API requests. This is the Fetch API, a new standard to make server requests with Promises, but which also includes additional features.
In this tutorial, you will create both GET and POST requests using the Fetch API.
Sara Vieira
The foundation of conditional statements can be boiled down to this: if this is true then run this code. You can also expand on that: if this is true then run this code, if not run a different code. You can get carried away on different ways to mold a statement.
Joe Pichardo
A Promise is an object representing the eventual completion or failure of an asynchronous operation. Let's see how we can use them and access the returned data.
Katsiaryna (Kate) Lupachova
A Stack Overflow discussion showing how to use either callbacks or async/await with fetch in order to store JSON into a variable for use later in the codepath.
