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HTML

              
                
              
            
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CSS

              
                
              
            
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JS

              
                /****************************/
/*   Texas hold 'em         */
/****************************/
// 5 Cards in a hand
// Card options:
// Numbers: 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K, A

/** Win conditions
High Card : Highest value card
One Pair : Two cards of equal value
Three of a Kind : Three cards of equal value.
Straight : Cards are consecutive values 
*/


/**
 * Input: Array of player's hands. Each hand consists of 5 cards and will always be valid. You do not need to worry about checking uniqueness of cards or suits
 * 
 * 
 * Output: Index of the winning hand. There will always be a winner, in the case of tied hands, the highest card wins
 * 
 */
const playCameoHoldEm = (playerHands = []) => {
  // your implementation here
  const cards = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A']
  const cardValues = cards.reduce((previous, current, index) => {
    previous[current] = index
    return previous
  }, {})
  const winValues = {
    highCard: 0, // Highest value card
    onePair: 1, // Two cards of equal value
    threeOfKind: 2, // Three cards of equal value.
    straight: 3 // Cards are consecutive values 
  }
  const sortHand = (a, b) => {
    if (cardValues[b] < cardValues[a]) {
      return -1;
    }
    if (cardValues[b] > cardValues[a]) {
      return 1;
    }
    return 0;
  }
  let currentWinningIndex = -1;
  let currentHighCardValue = -1;
  let currentWinCondition = -1;

  playerHands.forEach((hand, index) => {
    hand.sort(sortHand).forEach(card => {
      const matchingCards = hand.filter(matchingCard => matchingCard === card).length
      const isStraight = (hand) => {
        return hand.filter((card, index) => cardValues[card] - cardValues[hand[index + 1]] === 1).length === 4;
      }
      // console.log({ hand, currentWinCondition, currentHighCardValue, currentWinningIndex })
      // check for straight
      if (currentWinCondition <= winValues.straight && isStraight(hand)) {
        currentWinCondition = winValues.straight;
        // set higher value straight to winner
        if (cardValues[card] > currentHighCardValue) {
          currentHighCardValue = cardValues[card];
          currentWinningIndex = index;
        }

      // check for three of a kind
      } else if (currentWinCondition <= winValues.threeOfKind && matchingCards === 3) {
        if (currentWinCondition < winValues.threeOfKind || cardValues[card] > currentHighCardValue) {
          currentHighCardValue = cardValues[card];
          currentWinningIndex = index;
        }
        currentWinCondition = winValues.threeOfKind;

      // check for pairs
      } else if (currentWinCondition <= winValues.onePair && matchingCards === 2) {
        if (currentWinCondition < winValues.onePair || cardValues[card] > currentHighCardValue) {
          currentHighCardValue = cardValues[card];
          currentWinningIndex = index;
        }
        currentWinCondition = winValues.onePair;

      // check/set high card
      } else if (currentWinCondition <= winValues.highCard && cardValues[card] > currentHighCardValue) {
        currentHighCardValue = cardValues[card];
        currentWinCondition = winValues.highCard;
        currentWinningIndex = index;
      }
    })
  })
  return currentWinningIndex;
}

/** TEST CASES */
console.log('============')
const assertOrFail = (testCase, input, expected) => { input === expected ? console.log(`[${testCase}] success`) : 
console.log(`[${testCase}] failure: input ${input} does not equal expected ${expected}`);}

// Simple cases
// high card
assertOrFail(
  'High Card',
  playCameoHoldEm([
    ['3', '2', 'J', '7', '4'],
    ['5', '6', '4', '2', '9'],
    ['5', '6', '4', '2', '9'],
    ['5', '6', 'Q', '2', '9'],
    ['5', '6', '4', '2', '9'],
  ]),
3);

// one pair vs high card
assertOrFail(
  'One pair',
  playCameoHoldEm([
    ['2', '2', '10', 'J', '4'],
    ['A', '10', '5', '3', '9'],
    ['A', '10', '5', '3', '3'],
  ]),
2);


// one pair vs one pair
assertOrFail(
  'Pair vs Pair',
  playCameoHoldEm([
    ['2', '2', 'J', '7', '4'],
    ['5', '5', '10', '3', '9'],
    ['3', '3', 'J', 'A', '9']
  ]),
1);


// one pair vs 3 of a kind
assertOrFail(
  'Three of a kind',
  playCameoHoldEm([
    ['2', '2', 'J', '7', '4'],
    ['5', '5', '5', '3', '9'],
    ['2', '2', '2', 'J', '4'],
    ['7', '7', 'Q', 'J', '4'],
    // ['7', '5', 'A', '5', '5'], // this would test equal three of a kind but high card wins
  ]),
1);


// // straight vs pair
assertOrFail(
  'Straight',
  playCameoHoldEm([
    ['2', '3', '6', '5', '4'],
    ['10', '10', '9', 'Q', '8']
  ]),
0);


// 3 hands
assertOrFail(
  'Three Hands',
  playCameoHoldEm([
    ['10', '10', 'Q', 'J', 'A'],
    ['2', '2', '6', '5', '9'],
    ['7', '7', '7', '8', 'Q']
  ]),
2);


              
            
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