空の要素を切り詰める処理

XX.m

#import <Foundation/Foundation.h>

// gcc -framework Foundation XX.m -o XX.exe

int main(int argc, const char *argv[]){
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  // STEP1 普通にjoinする（空の要素がない場合）
  NSArray *array_part_a = [NSArray arrayWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", nil];
  NSString *string_a = [array_part_a componentsJoinedByString:@" / "];
  NSLog(@"%@\n\n", string_a);

  // STEP2 普通にjoinする（空の要素がある場合）
  NSArray *array_part_b = [NSArray arrayWithObjects:@"1", @"", @"3", @"", @"5", @"6", nil];
  NSString *string_b = [array_part_b componentsJoinedByString:@" / "];
  NSLog(@"%@\n\n", string_b);

  // STEP3
  NSMutableArray *new_array = [[NSMutableArray alloc] init];

  for (NSString *temp_str in array_part_b) {

    if (temp_str != nil && ![temp_str isEqualToString:@""]) {
      [new_array addObject:temp_str];
    }
  }

  NSString *string_c = [new_array componentsJoinedByString:@" / "];

  NSLog(@"%@\n\n",string_c);

  [pool drain];
  return 0;

}