      
                    &lt;optional><br>
                

                

                
                </td>
            

            
                <td class="default">
                
                    this.at(-1)
                
                </td>
            

            <td class="description last">The initial accumulator value. Defaults to the last typed array element.</td>
        </tr>

    
    </tbody>
</table>






<dl class="details">

    

    

    

    

    

    

 