When should you use `task {}` vs `onAppear {}` in SwiftUI?

Answer: Both run code when a view appears, but task {} is purpose-built for async work.

	onAppear	task
Async support	❌ No	✅ Yes
Auto-cancels	❌ No	✅ Yes (when view disappears)
Retry on id change	❌ No	✅ With id: parameter

Code Example:

struct ArticleView: View {
    @State private var article: Article?

    var body: some View {
        Text(article?.title ?? "Loading...")
            .task {
                // automatically cancelled if view disappears
                article = await ArticleService.fetch()
            }
    }
}