How to check if an object is empty? [javascript]

Question

I need to evaluate if an object is empty.

For example suppose I have an object:

var home = ....;     // this is an object and after I print it

console.log(home)    // the result of this option is []

//now I need to check if a object is empty or null
if( home == null || home == undefined )
{
    // I don't know specify how object is empty
}

How can I detect whether or not the above object home is null/empty?

Answer 1

To check for an empty array

if (!arr.length) {
  // if the array is empty
}

and for an object (check that it has no keys)

if (!Object.keys(obj).length) {
  // if the object is empty
}

DEMO

Answer 2

Only way I see so far may be ({}).toSource() === o.toSource()

Example:

var y = {a: 't'};
window.console.log(({}).toSource() === y.toSource());
delete y.a;
window.console.log(({}).toSource() === y.toSource());

EDIT : Oh, nicely found, Andy.