related to null safety?
Closed this issue · 2 comments
For the pizza json chapter 8 I believe with a factory constructor, null cannot be returned. Please update the code. I have no idea what purpose the factory serves now except if there is a cache of instantiated pizzas in the pizza class which then could be used to optimize a bit by not having to instantiate every instance. But I am unclear on the "how" this works under the hood.
I believe that now due to null-safety this should be migrated to be a static method that returns null, which would then allow it to maintain it's intended functionality.
factory Pizza.fromJsonOrNull(Map<String, dynamic> json)
would become
static Pizza? fromJsonOrNull(Map<String, dynamic> json)
Please see this documentation - https://dart.dev/null-safety/faq#how-should-i-migrate-a-factory-that-can-return-null
Thank you @luketg8 for the solution