Self invoking functions javascript

I wrote a self invoking function in both firefox and chrome it it wouldn't invoke.

I wrote something to the effect of

(function () { alert("THE"); })();

do self invoking functions not work in current browsers?

Thank you

edit: I did include all essential tags and all other code works on the page



"Self-invoking functions" are not really a part of javascript, it's just a term that people are calling a specific pattern of code (like AJAX, etc.); these patterns should work anywhere that javascript works.

What you're calling a "self-invoking function" is just creating an anonymous function and immediately calling it (as opposed to say storing it in a var, as an object value, as a function param, etc.).

That is, the following are basically the same:

var f = function(){...}; f()


( function(){...} )()

So because your 'self-invoking function' is a basic part of javascript, there is no possible way it's not working unless the insides aren't working or your environment is messed up. You could copy-paste your code onto a new blank page, and it would work fine. Something else must be going wrong:

Check your errors in your dev console. Specifically, check to make sure you don't have a syntax error or that there isn't some weird thing going on with the webpage you're testing it on (e.g. if you somehow redefine alert...).


I had this issue with a self invoking function which produced this error...

Uncaught TypeError: object is not a function

The problem was caused by not having a semi colon ending the line before the opening bracket


That function works. Javascript supports functional programming, so for a browser not to run that code, even for a very old browser that would be absurd. Are you sure that statement is being reached? Try debugging javascript that occurs before that statement.

<script type="text/javascript">
  (function() {
     alert('Hello World!');

Works in every browser I have installed on this machine.


This function definitely works. I would check your browser's console for any js errors in your page. Perhaps you could try to put a simple console.log function at the beginning of your script to see if any JavaScript is being called in the first place.


This self invoking function with return value will work in all current browsers(Safari, Chrome and Firefox) without issue. This function executes immediately, automatically and anonymously.

<script type="text/javascript">
        return("Hello World");


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