JS implmentation of RavenDB NoCache

NoCacheJS.js

// JS implmentation of Raven.Client.Silverlight.Connection.RavenUrlExtensions.NoCache
//public static string NoCache(this string url)
//{
//	return (url.Contains("?"))
//		? url + "&noCache=" + Guid.NewGuid().GetHashCode()
//		: url + "?noCache=" + Guid.NewGuid().GetHashCode();
//}


// http://note19.com/2007/05/27/javascript-guid-generator/
function S4() {
   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}

function guid() {
   return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
}

// http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
String.prototype.hashCode = function(){
  var hash = 0;
  if (this.length === 0) return hash;
  for (i = 0; i < this.length; i++) {
      char = this.charCodeAt(i);
      hash = ((hash<<5)-hash)+char;
      hash = hash & hash; // Convert to 32bit integer
  }
  return hash;
};

console.log(guid().hashCode());