# differenceFromOrderedSet: Compares two ordered sets to create a difference object that represents the changes between them. ``` - (NSOrderedCollectionDifference *) differenceFromOrderedSet:(NSOrderedSet *) other; ``` ## Discussion The difference method creates the difference object by comparing objects within the ordered sets with the `isEqual:` method. The following example computes the difference between two ordered sets: ```objc NSOrderedSet *original = [NSOrderedSet orderedSetWithObjects:@"1", @"2", nil]; NSOrderedSet *modified = [NSOrderedSet orderedSetWithObjects:@"1", @"2", @"3", nil]; NSOrderedCollectionDifference *diff = [modified differenceFromOrderedSet:original]; NSLog(@"diff is: %@", diff.debugDescription); // diff.hasChanges == true // diff.insertions.count == 1 // diff.removals.count == 0 ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)