How to check if object is empty? [duplicate]

Question

Possible Duplicate:
is object empty?

So let's var someObject = { }; how can i detect that object hasnt any properties and methods?

xanatos · Accepted Answer · 2011-10-21 09:33:52Z

5

function isEmpty(ob){
   for(var i in ob){ return false; }
   return true;
}

isEmpty({a:1}) // false
isEmpty({}) // true

edited Oct 21, 2011 at 9:33

xanatos

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answered Oct 21, 2011 at 9:26

SShebly

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4 Comments

xanatos Over a year ago

That won't work if someone has added a method to object.prototype. Read here yuiblog.com/blog/2006/09/26/for-in-intrigue

user113716 Over a year ago

@xanatos: If "someone" adds to Object.prototype, you track it down, remove the offending code, then remove the offending developer.

xanatos Over a year ago

@Ӫ_._Ӫ In the real world, it is possible to have object.prototype extensions. There were even some quite famous libraries that did it (but I don't remember which ones were).... mmmmh an example in this bug report bugs.jquery.com/ticket/1529 and even older versions of the prototype library

user113716 Over a year ago

@xanatos: That jQuery bug is a great example. You're probably aware that the json2 library (which was the cause of that bug) no longer extends Object.prototype as the original did. Same with prototypejs. They both removed the offending code. ;)

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