JSFiddle - React, Tailwind, and code Playground
HTML
<table>
<tr><td>Test</td></tr>
<tr><td>Test</td></tr>
<tr><td>Test</td></tr>
<tr><td>Test</td></tr>
<tr><td>Test</td></tr>
</table>
JavaScript
$('table').hide();
$('tr:eq(0)').hide();
$('tr:eq(2)').hide();
alert($('tr:not([style*="display: none"])').length);