jquery anonymous function declaration meanings
Are the following assumptions accurate?
1) execute immediately
(function(){
})();
2) execute on document ready
$(document).ready(function(){
});
3) shorthand for on document ready
$(function(){
});
4) alternative shorthand for on document ready for avoiding cross script conflicts
(function($) {
})(jQuery);
Yes your definitions are correct, for the first 3 🙂
Though, unless you need a closure, a statement will execute immediately, no reason to wrap it like #1 has (there are certainly plenty of valid times you need a closure, just noting if you don’t…it’s superfluous).
Number 4 however is not correct, (function($) { })(jQuery); is not tied to any event, it’s just a closure so that $ === jQuery inside of it, so you can use the $ shortcut:
(function($) {
//You may use $ here instead of jQuery and it'll work...even if $ means
//something else outside of this closure, another library shortcut for example
})(jQuery);
Here’s the #4 you were looking for:
jQuery(function ($) {
});
It will run on document.ready, within a namespace, and with jQuery defined as $.
