Every year, at WWDC, Apple gives us a lot of new things to play around with. For the big new things, they prepare session videos and labs so developers can experiment with the new technologies and hopefully integrate them in their apps by the time the new OSes are out.
The “big things” are one thing, but Apple introduces a bunch of new APIs every year. Many (oh boy, many) of them do not get any coverage at WWDC at all. Not in a session, and sometimes not even a small mention of them anywhere.
If you have been writing Swift in the past couple of years, you have probably been using Codable (which is really just the composition of Decodable and Encodable in the same protocol).
If you have been writing iOS apps for longer, you likely know about JSONSerialization as well, which is the backbone of Codable and it allows you to do more manual work when parsing JSON, seemingly giving you more control.
If you know JSONSerialization, you have probably found times in which Codable seemingly doesn’t give you the flexibility you need, and you may have been tempted to drop Codable in favor of JSONSerialization when parsing very specific or even corrupted JSON.
