JSFiddle - React, Tailwind, and code Playground

HTML

<table id="table">
<tr>
<th>Type</th>
<th>Text</th>
<th>Time</th>
<th>Notification Time</th>
</tr>
<tr>
<td>Lab1</td>
<td>Some Text</td>
<td>Day of Week</td>
<td>Monday, Wednessday</td>
</tr>
<tr>
<td>Lab2</td>
<td>Some Text</td>
<td>Day of Week</td>
<td>Tuesday, Wednessday</td>
</tr>
</table>

<ul id="array">
</ul>

JavaScript

/**
 * Provides simple functionality to convert a table to an array
 */
function ArrayParser() {
    /**
     * Converts a table column to an array
     * @param {string} table jQuery selector for target table
     * @param {string} column Should match th content
     * @return {array} Array of td contents
     */
    this.getArray = function (table, column) {
        var node = $(table + ' th:contains(' + column+ ')'),
            index = node.index();
        return this.getValuesByIndex(table, index);
    }
    
    /**
     * Finds table colums by index for all rows
     * @param {string} table jQuery selector for target table
     * @param {number} index The column index
     * @return {array} Array of td contents
     */
    this.getValuesByIndex = function (table, index) {
        var nodes = $(table + ' td:nth-child(' + (index + 1) + ')'),
            results = [];
        
        nodes.each(function (key, value) {
            results.push($(value).text());
        });
        
        return results;
    }
}


//// Some testing code ////


function main() {
    var parser = new ArrayParser(),
        result = parser.getArray('#table', 'Type');
        
    $.each(result, function (key, value) {
        $('#array').append('<li>' + value + '</li>');
    });    
}

$(document).ready(function () {
    main();
});