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    <p>The <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/NSArray.html#//apple_ref/occ/instm/NSArray/sortedArrayUsingDescriptors:" rel="noreferrer"><code>sortedArrayUsingDescriptors:</code></a> <code>NSArray</code> method does most of what you need:</p> <blockquote> <p>The first descriptor specifies the primary key path to be used in sorting the receiver’s contents. Any subsequent descriptors are used to further refine sorting of objects with duplicate values. See NSSortDescriptor for additional information.</p> </blockquote> <p>Some filtering with <code>NSPredicate</code> is required too:</p> <pre><code>NSSortDescriptor *timeSD = [NSSortDescriptor sortDescriptorWithKey: @"time" ascending: YES]; NSMutableArray *sortedByTime = [UnsortedArray sortedArrayUsingDescriptors: timeSD]; NSMutableArray *sortedArray = [NSMutableArray arrayWithCapacity:[sortedByTime count]]; while([sortedByTime count]) { id groupLead = [sortedByTime objectAtIndex:0]; NSPredicate *groupPredicate = [NSPredicate predicateWithFormat:@"name = %@", [groupLead name]]; NSArray *group = [sortedByTime filteredArrayUsingPredicate: groupPredicate]; [sortedArray addObjectsFromArray:group]; [sortedByTime removeObjectsInArray:group]; } </code></pre> <p>I have no idea if this is the most efficient method, but until you have reason to believe that it is causing problems there's no need to worry the performance implications. It's premature optimisation. I wouldn't have any concerns about the performance of this method. You've got to trust the framework otherwise you'll end up rewriting it (thus undermine the point of the framework) due to an unfounded paranoia. </p>
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    1. COThis does not answer the question: my situation is more complicated than simply sorting by name.
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    2. CO@Jaanus. Ohhh I see. I didn't notice that the order of the groups is dependent on the time.
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    3. CO@Jaanus. I've updated the code so that it actually answer the question!
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