JSFiddle - React, Tailwind, and code Playground

JavaScript

var rigorLabels = $('.subHeader', standardsTable);
var itemCounts = new Array($('.itemTypeLabel', standardsTable).length);
for (var i = 0; i < itemCounts.length; i++) {
    itemCounts[i] = 0;
}

var rigorArray = [];
for (var i = 1; i < rigorLabels.length; i++) {
    rigorArray[rigorLabels[i].innerHTML.toString()] = [].concat(itemCounts); // here was added concat
}

$('.itemTypeLabel', standardsTable).each(function (itemIndex) {
    itemTypes += '"' + $(this).html() + '",';
    var itemTypeName = $(this).html().replace(' ', '').replace('/', '');

    $('.subHeader:not(:First)', standardsTable).each(function () {

        var rigorName = $(this).html().toString();
        var itemInput = $('#' + $(this).html() + '_' + itemTypeName + '_input');
        if (typeof (itemInput.attr('value')) != 'undefined' && itemInput.attr('value') != '')
            rigorArray[rigorName][itemIndex] = parseInt(itemInput.attr('value'));
    });
});