self evoking switch function in jsx view

gistfile1.txt

<td>
                    {(() => {
                      switch(array.od.stage) {
                        case "Ready To Pick":
                          return <button
                          onClick={() => this.handleShow(array.od.id)}
                          >
                            Start Picking
                          </button>;
                        case "Being Picked":
                          return <button>Start Picking</button>;
                        default:
                          return null;
                      }
                    })()}
</td>