Hash.implement({has:Object.prototype.hasOwnProperty,keyOf:function(value){for(var key in this){if(this.hasOwnProperty(key)&&this[key]===value)return key;}
return null;},hasValue:function(value){return(Hash.keyOf(this,value)!==null);},extend:function(properties){Hash.each(properties,function(value,key){Hash.set(this,key,value);},this);return this;},combine:function(properties){Hash.each(properties,function(value,key){Hash.include(this,key,value);},this);return this;},erase:function(key){if(this.hasOwnProperty(key))delete this[key];return this;},get:function(key){return(this.hasOwnProperty(key))?this[key]:null;},set:function(key,value){if(!this[key]||this.hasOwnProperty(key))this[key]=value;return this;},empty:function(){Hash.each(this,function(value,key){delete this[key];},this);return this;},include:function(key,value){var k=this[key];if(k==undefined)this[key]=value;return this;},map:function(fn,bind){var results=new Hash;Hash.each(this,function(value,key){results.set(key,fn.call(bind,value,key,this));},this);return results;},filter:function(fn,bind){var results=new Hash;Hash.each(this,function(value,key){if(fn.call(bind,value,key,this))results.set(key,value);},this);return results;},every:function(fn,bind){for(var key in this){if(this.hasOwnProperty(key)&&!fn.call(bind,this[key],key))return false;}
return true;},some:function(fn,bind){for(var key in this){if(this.hasOwnProperty(key)&&fn.call(bind,this[key],key))return true;}
return false;},getKeys:function(){var keys=[];Hash.each(this,function(value,key){keys.push(key);});return keys;},getValues:function(){var values=[];Hash.each(this,function(value){values.push(value);});return values;},toQueryString:function(base){var queryString=[];Hash.each(this,function(value,key){if(base)key=base+'['+key+']';var result;switch($type(value)){case'object':result=Hash.toQueryString(value,key);break;case'array':var qs={};value.each(function(val,i){qs[i]=val;});result=Hash.toQueryString(qs,key);break;default:result=key+'='+encodeURIComponent(value);}
if(value!=undefined)queryString.push(result);});return queryString.join('&');}});Hash.alias({keyOf:'indexOf',hasValue:'contains'});