How do I check this boolean hashmap is empty in javascript? [duplicate]

Question

Possible Duplicates:
Object comparison in JavaScript
How do I test for an empty Javascript object from JSON?

var abc = {};
console.log(abc=={}) //false, why?

Why is it false? How do I match a blank hash map...?

Answer 1

{} is a new object instantiation. So abc !== "a new object" because abc is another object.

This test works:

var abc = {};
var abcd = {
  "no": "I am not empty"
}

function isEmpty(obj) {
  for (var o in obj)
    if (o) return false;
  return true;
}

console.log("abc is empty? " + isEmpty(abc))
console.log("abcd is empty? " + isEmpty(abcd))

Update: Just now saw that several others suggested the same, but using hasOwnProperty

I could not verify a difference in IE8 and Fx4 between mine and theirs but would love to be enlightened