JavascriptパッケージHashMap

function HashMap()
{
    /** Map    **/
    var size = 0;
    /**    **/
    var entry = new Object();
    
    /**   **/
    this.put = function (key , value)
    {
        if(!this.containsKey(key))
        {
            size ++ ;
        }
        entry[key] = value;
    }
    
    /**   **/
    this.get = function (key)
    {
        return this.containsKey(key) ? entry[key] : null;
    }
    
    /**    **/
    this.remove = function ( key )
    {
        if( this.containsKey(key) && ( delete entry[key] ) )
        {
            size --;
        }
    }
    
    /**      Key **/
    this.containsKey = function ( key )
    {
        return (key in entry);
    }
    
    /**      Value **/
    this.containsValue = function ( value )
    {
        for(var prop in entry)
        {
            if(entry[prop] == value)
            {
                return true;
            }
        }
        return false;
    }
    
    /**    Value **/
    this.values = function ()
    {
        var values = new Array();
        for(var prop in entry)
        {
            values.push(entry[prop]);
        }
        return values;
    }
    
    /**    Key **/
    this.keys = function ()
    {
        var keys = new Array();
        for(var prop in entry)
        {
            keys.push(prop);
        }
        return keys;
    }
    
    /** Map Size **/
    this.size = function ()
    {
        return size;
    }
    
    /*    */
    this.clear = function ()
    {
        size = 0;
        entry = new Object();
    }
}

var map = new HashMap();

/*
map.put("A","1");
map.put("B","2");
map.put("A","5");
map.put("C","3");
map.put("A","4");
*/

/*
alert(map.containsKey("XX"));
alert(map.size());
alert(map.get("A"));
alert(map.get("XX"));
map.remove("A");
alert(map.size());
alert(map.get("A"));
*/

/**            Key **/
/*
var arrayKey = new Array("1","2","3","4");
var arrayValue = new Array("A","B","C","D");
map.put(arrayKey,arrayValue);
var value = map.get(arrayKey);
for(var i = 0 ; i < value.length ; i++)
{
    //alert(value[i]);
}
*/
/**      Key  ，          toString()           String   Key**/

/**                 toString()       .         **/

function MyObject(name)
{
    this.name = name;
}

/**
function MyObject(name)
{
    this.name = name;
    
    this.toString = function ()
    {
        return this.name;
    }
}
**/
var object1 = new MyObject("  ");
var object2 = new MyObject("  ");

map.put(object1,"  ");
map.put(object2,"  ");
alert(map.get(object1));
alert(map.get(object2));
map.remove("xxxxx");
alert(map.size());

/**            size = 1 **/

/**       toString()      ,           **/