What does function($) mean in javascript?

Question

I realize that the $ is just sort of a convention for naming variables pointing to jQuery objects, and is also the function for document.getElementById(), but does function($) m

Answer 1

Some code uses $ for jQuery (or other libraries) to keep the global scope clean. By default, jQuery takes over $ in the global scope, however, if extensions and whatnot avoid using the global $, it can keep the scope clean, along with helping jQuery work with other libraries.

(function ($) {
    //$ is now a jquery instance
})(jQuery);

Basically it's a way to instantly execute code with a jQuery object without the function depending on a global-level variable. (Closures can also be created with it... But that's the same idea [in this situation].)