var HashMap = function(){  this.initialize();}HashMap.prototype = {  hashkey_prefix : "<#HashMapHashkeyPerfix>",  hashcode_field : "<#HashMapHashcodeField>",  hashmap_instance_id:0,    initialize : function(){    this.backing_hash = {};    this.code = 0;    this.hashmap_instance_id += 1;    this.instance_id = this.hashmap_instance_id;  },    hashcodeField : function(){    return this.hashcode_field + this.instance_id;  },    put : function(key,value){    var prev;    if(key && value){      var hashCode;      if( typeof(key) === 'number' || typeof(key) === 'string' ){          hashCode = key;      }else{          hashCode = key[this.hashcodeField()];      }            if( hashCode ){        prev = this.backing_hash[hashCode];      }else{        this.code += 1;        hashCode = this.hashkey_prefix + this.code;        key[this.hashcodeField()] = hashCode;      }      this.backing_hash[hashCode] = [key,value];    }    return prev === undefined ? undefined : prev[1];  },  get : function(key){    var value;    if(key){      var hashCode;      if( typeof(key) === 'number' || typeof(key) === 'string'  ){        hashCode = key;      }      else{        hashCode = key[this.hashcodeField()];      }      if(hashCode){        value = this.backing_hash[hashCode];      }    }    return value === undefined ? undefined : value[1];  },  del : function(key){    var success = false;    if(key){      var hashCode;      if( typeof(key) === 'number' || typeof(key) === 'string'  ){        hashCode = key;      }      else{        hashCode = key[this.hashcodeField()];      }      if(hashCode){         var prev = this.backing_hash[hashCode];         this.backing_hash[hashCode] = undefined;         if(prev !== undefined){           key[this.hashcodeField()] = undefined;           success = true;         }      }    }    return success;  },     each : function(callback,args){      var key;      for( key in this.backing_hash){         if(callback.call(this.backing_hash[key][1], this.backing_hash[key][0], this.backing_hash[key][1]) === false)              break;      }      return this;   },   toString : function(){       return "HashMapJS"       }}