JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

//Please note: this will work in most browsers which do not have web worker support, because the library falls back to a single thread.

//Minimum test case (works in chrome, firefox)
var test = new Ozai({
    fn: function (a,b,cb) {
        cb(a + " + " + b + " = " + (a + b));
    }
});

test.fn(100, 200, function(sum) {
    document.getElementById("output").textContent = sum;
});

//Below is the library I am working on to create the web worker
function Ozai (obj) {
	var worker;
	var self = this;
	
	/* Thank you, broofa.
	 * http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript */
	function makeID () {
		return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
			var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
			return v.toString(16);
		});
	}

	function createObjectURL (file) {
		if (window.webkitURL) {
			return window.webkitURL.createObjectURL(file);
		} else if (window.URL && window.URL.createObjectURL) {
			return window.URL.createObjectURL(file);
		} else {
			return null;
		}
	}

	function __init__ () {
		//build the worker script node
		var workerScript = 
			"scopeObj = {};												\
			\nself.onmessage = function(e) { 							\
			\n 	var msg = e.data;										\
			\n	var id = msg.id;										\
			\n	var fn = msg.fn;										\
			\n	var args = msg.args										\
			\n		.concat([ function() {								\
			\n			self.postMessage({args: Array.prototype.slice.call(arguments, 0), id: id});	\
			\n		}]);												\
			\n 	scopeObj[fn].apply(scopeObj,args);						\
			\n}";
		
		//create functions for this thread to call
		var isFunction = function(obj) {
			return !!(obj && obj.constructor && obj.call && obj.apply);
		};

		for(var i in obj) {
			if(isFunction(obj[i]))
				workerScript +=	"\nscopeObj['" + i + "'] = " +	obj[i].toString();
			else
				workerScript +=	"\nscopeObj['" + i + "'] = " + JSON.stringify(obj[i]);
		}

		//create worker from script node
		if(window.Worker) {
           ...