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Javascript - How to know if an object is Empty

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Assuming that by empty means "has no properties of its own"

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  1. // Speed up calls to hasOwnProperty
  2. var hasOwnProperty = Object.prototype.hasOwnProperty;
  3.  
  4. function is_empty(obj) {
  5.  
  6.     // null and undefined are empty
  7.     if (obj == null) return true;
  8.     // Assume if it has a length property with a non-zero value
  9.     // that that property is correct.
  10.     if (obj.length && obj.length > 0)    return false;
  11.     if (obj.length === 0)  return true;
  12.  
  13.     for (var key in obj) {
  14.         if (hasOwnProperty.call(obj, key))    return false;
  15.     }
  16.  
  17.     return true;
  18. }

URL: http://stackoverflow.com/questions/4994201/is-object-empty

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