REACT: Double ampersand if statement used in JSX output

doubleAmpersandIf.js

//Read 'if the value in institutions is true, then execute the following .map() code'. I think it's an ES6 thing....
{ institutions &&
  institutions.map((institutions) => (
      <tr key={institutions.organization}>
          <td width="15%">
            {institutions.pctHeld.fmt} 
          </td>
          <td width="60%">
            {institutions.organization}  
          </td>
          <td width="25%" align="right">
            {institutions.position.fmt}   
          </td>
      </tr> 
  ))
}