//Recently discovered a newly discovered array to deduplicate, no need to loop, just one line of code
// remove duplicates from the array
     NSArray *oldArr = @[@"1",@"2",@"3",@"4",@"5",@"6",@"2",@"3"];
     NSArray *newarr = [oldArr valueForKeyPath:@"@distinctUnionOfObjects.self"];
     NSLog(@"%@",newarr);