Always provide explicit identifiers for list items using the `id` parameter and avoid using index-based identification. This ensures SwiftUI can properly track view identity across data changes.

struct ContentView: View {
    let items = Array(1...1000)
    
    var body: some View {
        List(items, id: \.self) { item in
            ItemRow(value: item)
                .id(item)
        }
    }
}

struct ItemRow: View {
    let value: Int
    
    var body: some View {
        HStack {
            Text("Item \(value)")
            Spacer()
            Text("Value")
                .foregroundColor(.secondary)
        }
        .padding(.vertical, 2)
    }
}

Why This is a Best Practice

Proper view identification prevents unnecessary view recreation, maintains scroll position during updates, and enables smooth animations when items are added, removed, or reordered. Without stable IDs, SwiftUI may rebuild entire view hierarchies unnecessarily.