Why does this "(jQuery)" exist at the end of the function?

Question

Why does this "(jQuery)" exist at the end of the function?

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#1 by (2 votes)

1

I would like to know why this (jQuery) statement exists at the end of function .

jQuery(function($){

    // alert('Oi');
    $(".widgets-holder-wrap").removeClass('closed');

})(jQuery);

jquery

asked by anonymous 29.07.2015 / 16:02

1 answer

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score 2 · Accepted Answer

When you write (function() { ... })() you are making the code inside the function literal, so that the whole object is actually a function. Then you are invoking the function, with () at the end. This is used to control the visibility of functions and variables. JQuery plugins are usually written like this.

Being a function, you can pass whatever you want on () at the end. For example:

(function(jQ) { ... })(jQuery)

This is the definition of a function that receives a jQ parameter (known only in the context of the function) that is then called by passing a parameter (which in this case is external, a reference to jQuery).

Working in this way has some advantages:

You can redefine a global parameter and give it a meaningful name in that local context.
There is a small gain in performance since it is faster to search for something in the local scope and not to search the entire range of scopes to the global.
There are benefits to compressing your javascript.