JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <th>id</th>
        <th>name</th>
        <th>number</th>
        <th>result</th>
    </thead>
    <tbody>
        <tr>
            <td>stuff</td>
            <td>stuff</td>
            <td>stuff</td>
            <td>stuff</td>
        </tr>
    </tbody>
</table>

CSS

.red {
    background-color:red;
}

JavaScript

var resultHeaderIndex = $('th:contains("result")')
    .addClass('red')
    .index();
$('td:nth-child(' + (resultHeaderIndex + 1) + ')').addClass('red')