Bird
0
0

What will happen if you call save() on an NSManagedObjectContext without any changes?

medium📝 Predict Output Q5 of 15
iOS Swift - Local Data Persistence
What will happen if you call save() on an NSManagedObjectContext without any changes?
ANothing happens, save returns true immediately
BAn error is thrown
CThe context resets
DThe app crashes
Step-by-Step Solution
Solution:

  1. Step 1: Understand save() behavior

    Calling save() on a context with no changes does nothing and returns true immediately.

  2. Step 2: Check error or crash possibilities

    No error or crash occurs because no changes need saving.

  3. Final Answer:

    Nothing happens, save returns true immediately -> Option A

  4. Quick Check:

    Save without changes = no-op success [OK]
Quick Trick: Save without changes returns success immediately [OK]
Common Mistakes:
  • Expecting error on empty save
  • Thinking context resets automatically
  • Assuming crash on save

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More iOS Swift Quizzes
Animations - withAnimation - Quiz 12easy Concurrency - Task and TaskGroup - Quiz 7medium Concurrency - Async functions - Quiz 5medium Lists and Data Display - Swipe actions - Quiz 7medium Lists and Data Display - Why lists present dynamic content - Quiz 3easy Lists and Data Display - Identifiable protocol - Quiz 7medium Local Data Persistence - SwiftData setup (modern persistence) - Quiz 6medium Navigation - Sheet and fullScreenCover - Quiz 8hard Networking - URLSession basics - Quiz 12easy Networking - Error handling for network calls - Quiz 15hard