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I was going through one Backbone.js plugin in which I found the below piece of code.

callbacks : {
    search : $.noop,
    valueMatches : $.noop
What is the $.noop() function doing here?
                it is an empty function, which doesn't do anything, this is used so that you don't have to check whether the option is undefined before calling it
– Arun P Johny
                Feb 5, 2014 at 9:06
                Why not using function() {} directly? Because there is already a cached one used by jQuery already. :D
– stevemao
                Jun 5, 2015 at 5:30
  
You can use this empty function when you wish to pass around a
  function that will do nothing.
  
This is useful for plugin authors who offer optional callbacks; in the
  case that no callback is given, something like jQuery.noop could
  execute.
Documentation found here : http://api.jquery.com/jquery.noop/
        
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