我怎么能洗牌，然后从这个数组中随机显示一张卡片？

Question

class Card {
   constructor(suit, value) {  
    this.suit = suit;  
    this.value = value;
    }
}

TEST IF IT LETS ME MAKE A CARD

let card = new Card('Spades', 8);
console.log(card);

// MAKE A DECK OF 52 CARDS

class Deck {
    constructor () {
        this.deck =  [];  
    }
    createDeck (suits, values) {
        for(let suit of suits) {
            for(let value of values){
                this.deck.push(new Card (suit, value));
            }
        }
        return this.deck;


    }
}
const suits = ['Hearts', 'Diamonds', 'Clubs', 'Spades'];
const values = [2,3,4,5,6,7,8,9,10, 'Jack', 'Queen', 'King', 'Ace']
let deck = new Deck();
deck.createDeck(suits, values);
// console.log(deck);

I can create the deck I just dont know how to pick random items fom it. Any help would be appreciated.

Answer 1

since the created deck instance is attached to the deck variable you can access it by doing deck.deck .

so you can do something like:

deck.deck[Math.floor(Math.random() * 52)]

you can also use the Math.round function instead, depends on how precise you want to be

you could also create a function where you then pass your deck and get a card back. for example:

function pickCard(deck) {
  return deck[Math.round(Math.random() * 52))];
}

you can implement this as a method as well

    class Deck{
     // ...your code
     get pickCard() {
      return this.deck[Math.round(Math.random() * 52)];
     }
    }