Length of Javascript Object

objectSizeof.js

Object.size = function(obj) {
  if (obj.hasOwnProperty){
      var size = 0, key;
      for (key in obj) {
          if (obj.hasOwnProperty(key)) size++;
      }
      return size;
  }
  else {
    return Object.keys(obj).length
  }
};

// Get the size of an object
var size = Object.size(myObj);