Deck of cards

deckofcards.js

Array.prototype.hasOwnProperty('shuffle') || Object.defineProperty(Array.prototype, 'shuffle', {
    value: function() { return this.sort(() => Math.random() - .5); }
});

let deck = [...'♠♣♥♦'].flatMap(s => ('A,'+[...Array(11).keys()].slice(2)+',J,Q,K').split(/,/).map(c => c + s));

console.log(deck);
console.log(deck.shuffle());