Mein Code

Array.prototype.unique = function () {
    var keys   = {},
        result = [],
        items  = this.length
    
    while ( items )
        keys[ this[ --items ] ] = true
    
    for ( var key in keys )
        if ( !keys.hasOwnProperty( key ) ) 
            continue
        result.push( key )
    
    return result
}