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Q: 

How to sort an array of an array of objects by those objects attributes

If have an NSMutableArray foo of an NSMutableArray bar of objects. Each of the objects have a property that is a numerical value. In each NSMutableArray bar I want to sum this numerical property of each object. Then I want to sort the NSMutableArray foo by this sum. What's a good way to do this?

A: 

Take a look at NSSortDescriptor.

Chuck  2010-10-01 02:08:37

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