iOS: sorting an NSArray of core data objects

This question already has an answer here:

How do I sort an NSMutableArray with custom objects in it? 25 answers

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NSMutableArray *sortedArray;
sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
    NSNumber *s1 = @([(Struct *)a value]);
    NSNumber *s2 = @([(Struct *)b value]);
    return [s1 compare:s2];
}];

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