Objective-C Merge Sort

MergeSort.h

@interface MergeSort : NSObject
+ (NSArray *)mergeSort:(NSArray *)mergeList;
@end

@implementation MergeSort
+ (NSArray *)mergeSort:(NSArray *)mergeList {
  if([mergeList count] <= 1) {
    return mergeList;
  }
  int midIndex = [mergeList count] / 2;
  NSArray *leftArray = [self mergeSort:[mergeList subarrayWithRange:(NSRange){0, (midIndex)}]];
  NSArray *rightArray = [self mergeSort:[mergeList subarrayWithRange:NSMakeRange(midIndex, [mergeList count] / 2)]];
  return [MergeSort merge:leftArray with:rightArray];
}
+ (NSArray *)merge:(NSArray *)left with:(NSArray *)right {
  if ([left count] == 0) {
    return right;
  } else if ([right count] == 0) {
    return left;
  } else if (left[0] < right[0]) {
    return [@[left[0]] arrayByAddingObjectsFromArray:[self merge:[left subarrayWithRange:(NSRange){1,[left count] - 1}] with:right]];
  } else {
    return [@[right[0]] arrayByAddingObjectsFromArray:[self merge:[right subarrayWithRange:(NSRange){1,[right count] - 1}] with:left]];
  }
}
@end

Golly Gee Whiz, Objective-C is verbose...