JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr>
<td>1a</td><td>1b</td><td>1c</td>
</tr>
<tr>
<td>2a</td><td>2b</td><td>2c</td>
</tr>
<tr>
<td>3a</td><td>3b</td><td>3c</td>
</tr>
</table>

JavaScript

$(function() {
alert($('tr').length);
valuesArr = [];
$('tr').each( function() {
    var colNum = 0;
    $('td', this).each( function() {
        valuesArr[colNum] = valuesArr[colNum] ? valuesArr[colNum] : [];
        valuesArr[colNum].push( $(this).html() );   
        colNum++;
    });
});
    
alert(JSON.stringify(valuesArr));
});