To Get Duplicate as well as original items from an array in iOS

Question

I have an array, as

(John, Jane, John)

I want to get duplicates,as well as original elements of array like

(John,John) I am able to get single occurance from code here

NSArray *names = [NSArray arrayWithObjects:@"John", @"Jane", @"John", nil];
NSCountedSet *set = [[NSCountedSet alloc] initWithArray:names];

for (id item in set)
{
    NSLog(@"Name=%@, Count=%lu", item, (unsigned long)[set countForObject:item]);
    if((unsigned long)[set countForObject:item]>1){
        NSLog(@"of repeated element-----=%@",item);
    }
} 

"Name of repeated element-----John" but i want all occurences of repeated element like "Name of repeated element-----John,John" .

Answer 1

Try this Using NSPredicate:

NSArray *array = [NSArray arrayWithObjects:@"John", @"Jane", @"John",@"Jane",@"Jane", nil];
NSMutableArray *arrResult = [[NSMutableArray alloc] init];
NSCountedSet *set = [[NSCountedSet alloc] initWithArray:array];
for(id name in set)
   {
        if([set countForObject:name] > 1 ){
            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF = %@", name];
            [arrResult addObjectsFromArray:[array filteredArrayUsingPredicate:predicate]];
        }
    }
    //
    NSLog(@"%@",arrResult);