JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="res"></pre>

JavaScript

var types = {
    'undefined': undefined,
    'null': null,
    'boolean': true,
    'number': NaN,
    'string': '',
    'object': new Object()
}

var str = '\t\t| ';
for (var i in types) {
    str += i + ' | ';
}
$('#res').append(str + '\n');

var a = 0;
for (var i in types) {
    var b = 0;
    var str = i + '\t\t| ';
    for (var j in types) {
        if (b < a)
            continue;
        str += (typeof (types[i] + types[j])) + ' | ';
    }
    $('#res').append(str + '\n');
}