Check if a property exists - for use in debugger only. Very slow operation

propDeepExists

// Note: this function is evil, and probably should never be used.
// It may be useful for when you are working in the console/debugger
// and need to analyze some large object. Not for production.
// http://jsperf.com/check-if-deep-property-exists-with-willnotthrow
function propDeepExists(target, propPath){
  try {
     var result = eval("target." + propPath);
  } catch(e){
    return false;
  }
  return result ? true : false;
}