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let deck = { suits: ["hearts", "spades", "clubs", "diamonds"], cards: Array(52), createCardPicker: function() { // NOTE: the line below is now an arrow function, allowing us to capture 'this' right here return () => { let pickedCard = Math.floor(Math.random() * 52); let pickedSuit = Math.floor(pickedCard / 13); return {suit: this.suits[pickedSuit], card: pickedCard % 13}; } } } let cardPicker = deck.createCardPicker(); let pickedCard = cardPicker(); alert("card: " + pickedCard.card + " of " + pickedCard.suit);