What does this “(function(){});”, a function inside brackets, mean in javascript? [duplicate]

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You’re immediately calling an anonymus function with a specific parameter.

An example: 

(function(name){
  alert(name);
})('peter')

This alerts “peter“.

In the case of jQuery you might pass jQuery as a parameter and use $ in your function. So you can still use jQuery in noConflict-mode but use the handy $:

jQuery.noConflict()
(function($){
  var obj = $('<div/>', { id: 'someId' });
})(jQuery)

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