# differenceFromArray: Compares two arrays to create a difference object that represents the changes between them. ``` - (NSOrderedCollectionDifference *) differenceFromArray:(NSArray *) other; ``` ## Discussion The difference method creates the difference object by comparing objects within the arrays with the `isEqual:` method. The following example computes the difference between two arrays: ```objc NSArray *original = @[@"1", @"2"]; NSArray *modified = @[@"1", @"2", @"3"]; NSOrderedCollectionDifference *diff = [modified differenceFromArray:original]; // 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)