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copied!<p><code>NSArray</code>s <code>[filteredArrayUsingPredicate:][1]</code> is the tool for the job.</p> <p>As noted, your <code>listCategories</code> array will contain an array of <code>Category</code> objects with each category containing an array of <code>Element</code> objects.</p> <pre><code>// Retrieve "hotel" Elements NSPredicate *hotelPredicate = [NSPredicate predicateWithFormat:@"name == hotel"]; Category *hotelCategory = [[[listCategories filteredArrayUsingPredicate:hotelPredicate] objectAtIndex: 0] retain]; NSArray *hotels = [[hotelCategory listElements] retain]; // Split the array of Elements based on star value NSPredicate *elementRatingTemplate = [NSPredicate predicateWithFormat:@"stars == $STARS"]; NSPredicate *threeStarPredicate = [elementRatingTemplate predicateWithSubstitutionVariables: [NSDictionary dictionaryWithObject:@"3" forKey:@"STARS"]; NSArray *threeStarHotels = [[hotels filteredArrayUsingPredicate: threeStarPredicate] retain]; NSPredicate *fourStarPredicate = [elementRatingTemplate predicateWithSubstitutionVariables: [NSDictionary dictionaryWithObject:@"4" forKey:@"STARS"]; NSArray *fourStarHotels = [[hotels filteredArrayUsingPredicate: fourStarPredicate] retain]; NSPredicate *fiveStarPredicate = [elementRatingTemplate predicateWithSubstitutionVariables: [NSDictionary dictionaryWithObject:@"5" forKey:@"STARS"]; NSArray *fiveStarHotels = [[hotels filteredArrayUsingPredicate: fiveStarPredicate] retain]; // Do something with the filtered arrays // Clean up retained objects. </code></pre>

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