Common Errors

1. Not using MIL.
2. Not checking for arraySize == 0 in Constructor, Copy-Constructor, Copy-Assignment Operator, resizeArray(), thus doing new int[0].
3. Not setting data to nullptr after resizing to 0.
4. Forgetting to call delete [] in Destructor, Copy-Assignment Operator, resizeArray()
5. Calling delete [] in Copy-Constructor.
6. Creating temp array in insert() and remove() to copy, instead of just shifting and overwriting indices in-place.
7. Deleting both the old and new array in resizeArray().

   delete [] data;
   data = temp;
   delete [] temp;