Question

If I set an object using:

var a = {};

or

var a = new Object();

How can I test whether or not it has anything inside it if I don’t know specifically what to test for.

(something like a == {}, but this does not evaluate correctly)

Answer 1

You could use this simple function:

function isEmpty(object) {
    for(var property in object) {
        if(object.hasOwnProperty(property))
            return false;
    }

    return true;
}

But if you use jQuery: http://api.jquery.com/jQuery.isEmptyObject/