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## event-loop.md

      
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                jesstelford
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              October 16, 2025 15:48
            
              
                What is the JS Event Loop and Call Stack?
              
          
    Regular Event Loop

This shows the execution order given JavaScript's Call Stack, Event Loop, and
any asynchronous APIs provided in the JS execution environment (in this example;
Web APIs in a Browser environment)

Given the code

  
## gist:9104721
if (!(Symbol.iterator in Object.prototype)) {
	Object.defineProperty(Object.prototype,Symbol.iterator,{
		enumerable: false,
		writable: false,
		configurable: true,
		value: function() {
			var o = this;
			var idx = -1;
			var ks = Object.keys(o);
			return {
	if (!(Symbol.iterator in Object.prototype)) {
	Object.defineProperty(Object.prototype,Symbol.iterator,{
	enumerable: false,
	writable: false,
	configurable: true,
	value: function() {
	var o = this;
	var idx = -1;
	var ks = Object.keys(o);
	return {