List all properties of JavaScript objects

listallprops.js

function listAllProperties(o) {
  var objectToInspect;     
  var result = [];
 	
  for(objectToInspect = o; objectToInspect !== null; objectToInspect = Object.getPrototypeOf(objectToInspect)){  
    result = result.concat(Object.getOwnPropertyNames(objectToInspect));  
  } 	
  return result; 
}