difference between Immediately-Invoked Function and jQuery Immediately-Invoked Function

Question

i have read that (function(){})(); is called immediately and doesn't need to be called. and $(function()); is also immediately called.

are they both and have same functionality ?
does the Immediately-Invoked Function loaded after the document is completely loaded ?
what is the actual functionality of $(function()); ?
does $(function()); after the document is completely loaded ?

score 9 · Accepted Answer · answered Mar 12 '13 at 17:23

9

$(function(){});

isn't immediately called : it is called when the DOM is ready. It's a shortcut for

$(document).ready(function(){});

answered Mar 12 '13 at 17:23

Denys Séguret

What is it equivalent to in vanilla JavaScript? OnLoad()? – 1252748 Nov 24 '13 at 02:49
@thomas The best equivalent of ready would be [onreadystatechange](https://developer.mozilla.org/en-US/docs/Web/API/document.readyState) but most often, if you don't need the resources to be loaded, the simplest solution is to call your code from a script element at the end of the body (when the elements have already been defined). – Denys Séguret Nov 24 '13 at 08:48

score 1 · Answer 2 · answered Mar 12 '13 at 17:24

1

(function () {})() is an anonymous function that is immediately called.

$(function () {}); is jQuery shorthand for $(document).ready(function () {});

answered Mar 12 '13 at 17:24

MattDiamant

What is it equivalent to in vanilla JavaScript? OnLoad()? – 1252748 Nov 23 '13 at 00:22

2 Answers2