Removing elements with same value from NSMutableArray

Question

My NSMutableArray contains some strings as elements. One of the element is repeated many times at different indexes in the array. For example [@"", @"1,2,3",@"",@"5,3,2,1",@""]. I want to remove all the elements with value @"" from the mutable array. I tried following ways but couldn't get the solution.

1. Using For loop:

   for(id obj in myMutableArray)
   {
       if([obj isEqualToString:@""])
       {
           [myMytableArray removeObject:obj];
       }
   } 
   

2. Using dummy mutable array called nextMutableArray

   for(id obj in myMutableArray)
   {
       if([obj isEqualToString:@""])
       {
           continue;
       }
       else [nextMutableArray addObject:obj];
   }
   

In both the ways, elements (@"") at other indexes are removed but not at the index 0 (first object). What could be the possible reason? Is there any way to remove all the elements that contain string @"" from the mutable array?

Answer 1

one option is to filter your array using predicates:

NSArray *someArray = @[@"", @"1,2,3", @"", @"5,3,2,1", @""];
NSLog(@"%@", someArray);
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF != ''"];
NSArray *filteredArray = [someArray filteredArrayUsingPredicate:predicate];
NSLog(@"%@", filteredArray);