Question

In my iPhone app i have an array of stings.

fron that string i need to get the array of first charecters. For this i have implemented logic as follow. it works but in this i have retrieve charectes twicw 1.Small letters and 2.Capital letters.

I need to get only capital letters even it is the small letter.

like Only “A” for America, Africa and america, antantica

contactIndex = [[NSMutableArray alloc] init];

      for (int i=0; i<[contactsArray count]-1; i++){
            //---get the first char of each state---
            char alphabet = [[contactsArray objectAtIndex:i] characterAtIndex:0];
            NSString *uniChar = [NSString stringWithFormat:@"%C", alphabet];

            //---add each letter to the index array---
            if (![contactIndex containsObject:uniChar])
            {            
                  [contactIndex addObject:uniChar];
            }        
      }

Answer 1

See the Example, This will work

NSMutableArray *contactsArray = [[NSMutableArray alloc] initWithObjects:@"America",@"Africa",@"america",@"antantica", nil];    

for (int i=0; i<[contactsArray count]; i++){

        NSString *alphabet = [[contactsArray objectAtIndex:i] uppercaseString];

        NSString *firstCharactor = [alphabet substringToIndex:1];

       [contactIndex addObject:firstCharactor];

        NSLog(@"%@",firstCharactor);

 }