JavaScript: Adding if condition inside of a template variable

I have a template variable in Javascript as below

 var TABLE_ROW = '<tr class=>'
            + '<td><input id= type="checkbox" class="mysqlListCheckbox" checked="checked"/> <span style="padding: 7px;"></span></td>'
    + '<td><p class=text-warning></p></td>'
    + '</tr>';

At this moment ID is always checked but I want to modify it such as ID should not be checked/selected if COMMENTS is empty.

I am new to Javascript template variables. Any reference links to achieve this are highly appreciated.

Thank you.