Determining if all attributes on a javascript object are null or an empty string

Question

What is the most elegant way to determine if all attributes in a javascript object are either null or the empty string? It should work for an arbitrary number of attributes

Answer 1

Based on tymeJv's answer =)

function checkProperties(obj) {
var state = true;
  for (var key in obj) {
    if ( !( obj[key] === null || obj[key] === "" ) ) {
        state = false;
        break;
    }
  }
  return state;
}

var obj = {
  x: null,
  y: "",
  z: 1
}

checkProperties(obj) //returns false

Hope it helps =)