Regarding the instanceof an exception

[devinrhode2]

Most people most of the time probably don't care about the instanceof an exception. Here is some code I'm removing but is still pretty valuable:

    if (!ex.name) {
      ['Error'
      ,'EvalError'
      ,'RangeError'
      ,'ReferenceError'
      ,'SyntaxError'
      ,'TypeError'
      ,'URIError'
      ,'InternalError'
      ,'DOMException'
      ,'nsIXPCException'
      ,'nsIException'
      ,'DOMError'
      ,'FileError'
      // There are also errors with html5 api's, like MediaError, MediaKeyError, ErrorEvent,
      // ApplicationCache errors, and other html5 api errors that aren't "exceptions" really
      ].forEach(function(errorType) {
        if (!window[errorType]) return;
        if (ex instanceof window[errorType]) {
          ex.name = errorType;
        }
      });
    }

[devinrhode2]

Figured out how to list all error types that are an instanceof Error:

var thing;
var forbiddenKeys = [];
var gp = '';
var p = '';
var allKeys = Object.getOwnPropertyNames(window);
var index = allKeys.length;
var errorTypes = [];
while (index > 0) {
  index--
  p = allKeys[index];
  if (~forbiddenKeys.indexOf(p)) return;
  gp = p;
  thing = window[p];
  try {
    var aThing = new thing('a');
    if (aThing instanceof Error) {
      console.log(p);
    } else if (aThing.message && (aThing.stack || aThing.name)) {
      console.log('not error', p);
    }
  } catch ( _ ) {
    _;
  }
}

Checking in Opera, Chorme, Firefox, and Safari these are:

Error
TypeError
SyntaxError
ReferenceError
URIError
EvalError
RangeError

But FF also has InternalError

[devinrhode2]

I was also curious about all other globals that have "Error" or "Exception" in their identifier, so here's a snippit for that:

var allKeys = Object.getOwnPropertyNames(window);
var p = '';
for (var i = 0; i < allKeys.length; i++) {
  p = allKeys[i];
  try {
  if (~p.indexOf('Error') || ~p.indexOf('Exception') ) {
    console.log(p);
  }
  } catch (e) { e; }
}

Chrome:

ErrorEvent
MediaError
MediaKeyError
webkitSpeechRecognitionError
FileError
DOMException
AutocompleteErrorEvent

Opera:

ErrorEvent
MediaError
MediaKeyError
FileError
DOMException
AutocompleteErrorEvent 

Firefox:

DOMError
MediaError
DOMException
GetUserMediaErrorCallback
DataErrorEvent
GeoPositionErrorCallback
SpeechRecognitionError
GeoPositionError

Safari:

DOMException
SQLException
ErrorEvent
WebKitMediaKeyError
MediaError
XMLHttpRequestException
RangeException
XPathException
FileError
EventException
SVGException

Only "MediaError" is common amongst these 4 browsers, along the above list of Error types.