@State, @Bindable, @Environment: The Complete Map for @Observable (and the Question You're Actually Asking)
Day 12 of the 30-day iOS series. With @Observable, SwiftUI lets you slap @State, @Bindable, @Environment, or a plain let on the same class — and compiles all of them. Here's the question that actually decides which one is correct, one map that resolves 95% of the confusion, and three real BrewLog bugs (one silent, one a compile error, one a runtime crash) that come from picking wrong.
ObservableObject → @Observable: The Migration Guide That Skips the Marketing (and the Autoclosure Gotcha Apple Forgot to Mention)
Day 11 of the 30-day iOS series. Apple's migration guide makes ObservableObject → @Observable look like a find-and-replace. It mostly is — except for one quiet behavioral change: @StateObject only ran your initializer once, and @State runs it on every render. Here's the multiple-init bug that causes, why it's worst in exactly the init you were proud of, and how to fix it with a test that turns 'no side effects in init' into a hard, green invariant.