# Algorithm for counting number of decks in a given pack of cards

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You are given a pack of cards like
(["9C", "KS", "AC", "AH", "8D", "4C", "KD", "JC", "7D", "9D", "2H", "7C", "3C", "7S", "5C", "6H", "TH"]));
Where C, S, D, H stand for clubs, spade, Diamond and hearts respectively.
A given deck of cards has cards with values 2, 3, 4, 5, 6, 7, 8, 9, T, J, Q, K, A
where T = 10, J = jack, Q = queen, K = King and A = ace
Write a function deckOfCards() which will accept and array of cards as given above
and returns the number of decks present in that card array.

0
this.decksOfCards(["2S", "2C", "2D", "2H", "3S", "3C", "3D", "3H", "4S", "4C",
"4D", "4H", "5S", "5C", "5D", "5H", "6S", "6C", "6D", "6H", "7S", "7C", "7D", "7H",
"8S", "8C", "8D", "8H", "9S", "9C", "9D", "9H", "TS", "TC", "TD", "TH", "JS", "JC",
"JD", "JH", "QS", "QC", "QD", "QH", "KS", "KC", "KD", "KH", "AS", "AC", "AD", "AH",
"2S", "2C", "2D", "2H", "3S", "3C", "3D", "3H", "4S", "4C", "4D", "4H", "5S", "5C",
"5D", "5H", "6S", "6C", "6D", "6H", "7S", "7C", "7D", "7H", "8S", "8C", "8D", "8H",
"9S", "9C", "9D", "9H", "TS", "TC", "TD", "TH", "JS", "JC", "JD", "JH", "QS", "QC",
"QD", "QH", "KS", "KC", "KD", "KH", "AS", "AC", "AD", "AH", "2S", "2C", "2D", "2H",
"3S", "3C", "3D", "3H", "4S", "4C", "4D", "4H", "5S", "5C", "5D", "5H", "6S", "6C",
"6D", "6H", "7S", "7C", "7D", "7H", "8S", "8C", "8D", "8H", "9S", "9C", "9D", "9H",
"TS", "TC", "TD", "TH", "JS", "JC", "JD", "JH", "QS", "QC", "QD", "QH", "KS", "KC",
"KD", "KH", "AS", "AC", "AD"]);//output 2
decksOfCards = (inputCardArr) => {
let faces = [ "2", "3", "4", "5", "6", "7", "8", "9", "T", "J", "Q", "K", "A" ];
let suites = [ "S", "C", "H", "D" ];
let acceptedCards = [];
for (var f = 0; f<faces.length; f++) {
for (var s = 0; s<suites.length; s++) {
acceptedCards.push(faces[f] + suites[s]);
}
}
let decks = [];
for (var i = 0; i < inputCardArr.length; i++) {
if (!acceptedCards.includes(inputCardArr[i])) {
//check invalid card added by user
return;
}
for (var j = 0; j < decks.length; j++){
//decks cards arr check value
if (!decks[j].cards.includes(inputCardArr[i])){
decks[j].cards.push(inputCardArr[i]);
}
}
decks.push({cards:[inputCardArr[i]]});
}
}
console.log('decks='+JSON.stringify(decks));
const fullDeckCount = decks.filter(d => d.cards.length == 52).length;
console.log(fullDeckCount);
}

Output:

• output = 2
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