title: concatenating fields in react.js method
body: <p>I have the method below in my react.js application. I will like to concatenate
  this line {dt.productCode} {dt.sizeCode} {dt.itemWearerName} such that asterisk will 
  be between them.</p>
  
  <pre><code>        1234*xl*tester
  </code></pre>
  
  <p>How can I achieve that?</p>
  
  <pre><code>         renderInvoicesProducts(){
                  return this.state.invoicesProducts.map((dt, i) =&gt; {
                      return (
                          &lt;MenuItem key={i} value={dt.customerInvoiceProductId}&gt;
                              {dt.productCode} {dt.sizeCode} {dt.itemWearerName}
                          &lt;/MenuItem&gt;
                      );
                  });
              }
  </code></pre>