code: private void growReactionArray() {
          growArraySize = reactions.length;
          IReaction[] newreactions = new IReaction[reactions.length + growArraySize];
          System.arraycopy(reactions, 0, newreactions, 0, reactions.length);
          reactions = newreactions;
      }
docs: Grows the reaction array by a given size.
  
  @see    growArraySize