[node.js] Custom exception handling

#!/usr/bin/env node

function defineException(name, parent) {
  var _parent = (parent || Error);
  var ex = function(message) {
    _parent.call(this);
    _parent.captureStackTrace(this, this.constructor);
    this.name = (this.constructor.name || this._name);
    this.message = (message || '');
  }
  ex.prototype.__proto__ = _parent.prototype;
  ex.prototype._parent = _parent;
  ex.prototype._name = name;
  //return ex;
  global[name] = ex;
}

//var EvilError = defineException();
defineException('EvilError');

function lol() {
  console.log('lol. start');
  throw new EvilError('smth very bad!');
  console.log('lol. end');
}

try {
  //throw new Error('ololo');
  lol();
}
catch (err) {
  if (err instanceof EvilError) {
    console.log('>:E 13/666');
    console.log('name:    %s\nmessage: %s\nstack:   %s',
      err.name, err.message, err.stack);
  } else {
    console.log('name:    %s\nmessage: %s\nstack:   %s',
      err.name, err.message, err.stack);
  }
}