function deck() {
    
    function card(r,s) {
        this.rank = r;
        this.suit = s;
    }

    this.order = [
    new card('A','spades'), new card('2','spades'), new card('3','spades'), new card('4','spades'), new card('5','spades'),
    new card('6','spades'), new card('7','spades'), new card('8','spades'), new card('9','spades'), new card('10','spades'),
    new card('J','spades'), new card('Q','spades'), new card('K','spades'),
    new card('A','clubs'), new card('2','clubs'), new card('3','clubs'), new card('4','clubs'), new card('5','clubs'),
    new card('6','clubs'), new card('7','clubs'), new card('8','clubs'), new card('9','clubs'), new card('10','clubs'),
    new card('J','clubs'), new card('Q','clubs'), new card('K','clubs'),
    new card('A','hearts'), new card('2','hearts'), new card('3','hearts'), new card('4','hearts'), new card('5','hearts'),
    new card('6','hearts'), new card('7','hearts'), new card('8','hearts'), new card('9','hearts'), new card('10','hearts'),
    new card('J','hearts'), new card('Q','hearts'), new card('K','hearts'),
    new card('A','diams'), new card('2','diams'), new card('3','diams'), new card('4','diams'), new card('5','diams'),
    new card('6','diams'), new card('7','diams'), new card('8','diams'), new card('9','diams'), new card('10','diams'),
    new card('J','diams'), new card('Q','diams'), new card('K','diams')
    ];
    
    this.shuffle = function() {
        for (var i = 0; i < this.order.length; i++) {
            var j = i;
            while (j==i) {
                j = Math.floor(Math.random() * this.order.length);
            }
            var tmp = this.order[i];
            this.order[i] = this.order[j];
            this.order[j] = tmp;
        }
    };
    
    this.shuffle();
    
    this.top_card = function() {
        if(this.order.length==0)
            return false;
        this.order.shift();
        return true;
    };
}