how to remove duplicate value in NSMutableArray

Question

i\'m scanning wifi info using NSMutableArray, but there are few duplicate values appear, so i try to use following code but still getting the duplicate values,

Answer 1

I think its better to do this:

 NSMutableIndexSet *indexes = [[NSMutableIndexSet alloc]init];

 for(int j = 0; j < [myArray count]; j++) {

 for( k = j+1;k < [myArray count];k++) {

    NSString *str1 = [myArray objectAtIndex:j];
    NSString *str2 = [myArray objectAtIndex:k];
    if([str1 isEqualToString:str2])
        [indexes addIndex:k];
   }
}

[myArray removeObjectsAtIndexes:indexes];

You can run into problems if you manipulate the array while looping in my experience.