 class='lparen'>(</span><span class='id identifier rubyid_index'>index</span><span class='rparen'>)</span>
   <span class='ivar'>@colours</span><span class='lbracket'>[</span><span class='id identifier rubyid_index'>index</span><span class='rbracket'>]</span>
<span class='kw'>end</span></pre>
    </td>
  </tr>
</table>
</div>
    
      <div class="method_details ">
  <h3 class="signature " id="add-instance_method">
  
    #<strong>add</strong>(colour)  &#x21d2; <tt>Object</tt> 
  

  
    <span class="al