is there an an easier way to see if an object is empty?

Question

Sure i can do:

var obj = {};
if(Object.keys(obj).length == 0)

but i was curious if there is a way to say:

var obj = {};
if(obj.hasKeys())

or even:

//already tested, and this doesnt work.  its true because it *is* something.
var obj = {};
if(!obj)

Answer 1

function hasKeys(o) {
    for (var name in o)
        if (o.hasOwnProperty(name))
            return true;
    return false;
}