NSInteger MyComparisonFunction(id a, id b, void* context) {
  NSNumber *aNum = (NSNumber*)a[@"id"];
  NSNumber *bNum = (NSNumber*)b[@"id"];
  return [aNum compare:bNum];
}

NSArray* SortArray (NSArray* unsorted) {
  return [unsorted sortedArrayUsingFunction:MyComparisonFunction context:nil];
}