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?

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?

• javascript
• jquery

• 1 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 Commented Feb 5, 2014 at 9:06
• 2 Why not using function() {} directly? Because there is already a cached one used by jQuery already. :D – stevemao Commented Jun 5, 2015 at 5:30
• 1 Possible duplicate of What real purpose does $.noop() serve in jQuery 1.4? – Pang Commented Sep 19, 2016 at 7:57

1 Answer 1

$.noop is an empty function so in your case it's returning an empty function

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./jquery.noop/