day7.js

const input = `AJ44J 454
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53252 664
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44469 355
T6A2J 458
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T88K8 610
AT4A2 413
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33Q2T 556
56666 682
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J3366 409
62J9J 497
JAA8Q 892
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TA5JT 916
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KJK58 1
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JJ466 942
ATTTA 659
82248 698
Q9A83 368
6556T 553
JA8AJ 92
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2QQ82 302
86666 509
A5J42 263
T8J8K 742
AJ6T4 950
5K544 348
76359 210
689J4 983
37333 342
J2222 275
88848 900
A9TJT 895
8JK46 238
75457 247
Q29A2 568
79797 158
44T44 526
242JQ 924
22292 163
KAA6A 434
QJ9A2 417
633J5 39
J777J 668
86239 64
69993 61
226JK 791
J762K 350
J66A6 723
T5JJJ 116
33363 303
A2AJA 132
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57734 837
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44J4A 456
KK855 777
K8662 901
6JK8A 282
59575 550
QQQ6Q 612
T9KT9 985
QTT7T 66
95533 145
22794 771
5TAA7 17
4K354 621
7KKKK 635
K5A44 638
T9353 500
6926J 313
J9Q35 125
222JK 746
Q2QJ2 769
4A8JT 217
97775 649
6KAK5 165
Q7T67 614
TK8QT 724
2AJ23 809
3TTTA 518
KJ996 176
88588 802
K855A 623
Q7QQ7 581
T9AJ5 359
J4JJ5 867
56656 32
54566 884
4K5K4 708
Q5766 778
9867A 292
79888 592
K6Q25 220
644J6 654
Q78TK 161
AAAA8 877
JJTT6 112
T3ATA 261
33AAA 106
99494 81
99989 551
96TJ9 170
85J8A 181
79647 25
3K57Q 289
T5888 816
986Q5 471
KK6KK 504
3J8Q3 108
3A37A 764
JK5KK 76
2T2JA 423
AQQ6A 831
82228 534
T9TTT 93
942A2 648
K7Q89 637
35535 457
43KJJ 873
53A84 460
Q85K8 352
QTKTT 745
36893 49
2J99J 609
43K78 271
K3456 736
JQ462 894
6JQJQ 511
8J6K5 246
2Q777 972
J876T 800
Q5JQQ 656
JJAJT 817
9T6T9 615`;

// The strongest rank will have the rank of the (index of last entry + 1) and its bid will be multiplied by that
const sampleInput = `2345A 1
Q2KJJ 13
Q2Q2Q 19
T3T3J 17
T3Q33 11
2345J 3
J345A 2
32T3K 5
T55J5 29
KK677 7
KTJJT 34
QQQJA 31
JJJJJ 37
JAAAA 43
AAAAJ 59
AAAAA 61
2AAAA 23
2JJJJ 53
JJJJ2 41`;

const cardStrengths = [
  "A",
  "K",
  "Q",
  "T",
  "9",
  "8",
  "7",
  "6",
  "5",
  "4",
  "3",
  "2",
  "J",
];
// to determine strength, check indexOf character
const cardStrengthsSorted = cardStrengths.reverse();

const inputLines = sampleInput.split("\n").map((line) => {
  const [hand, score] = line.trim().split(" ");
  return {
    hand: hand.trim(),
    score: parseInt(score.trim(), 10),
  };
});

const handStrengthRegexes = [
  "fiveOfAKind",
  "fourOfAKind", // Four of a kind, where four cards have the same label and one card has a different label
  "fullHouse", // Full house, where three cards have the same label, and the remaining two cards share a different label
  "threeOfAKind", // Three of a kind where three cards have the same label, and the remaining two cards are each different from any other card in the hand
  "twoPair", // Two pair, where two cards share one label, two other cards share a second label, and the remaining card has a third label
  "onePair", // One pair, where two cards share one label, and the other three cards have a different label from the pair and each other
  "highCard",
];

/**
    rank all the cards in the input and multiply the bid with the rank.
    add them all together

    so, I guess, to find out a hand's type, I can match it against a regex.
    split the strength types into separate arrays.

    Then go through each array and sort them
*/

function isUnique(str) {
  return new Set(str).size == str.length;
}

const handRankings = inputLines.map(({ hand }, index) => {
  if (isUnique(hand)) {
    inputLines[index].strength = "highCard";
  }

  const handIncludesJ = hand.split("").sort().join("").match(/J/g);

  const numberOfJs =
    handIncludesJ && hand.split("").filter((letter) => letter === "J").length;

  let handMatch = hand
    .split("")
    .sort()
    .join("")
    .match(/([A-Z0-9])(?:.*)(\1)+/g);

  if (!handMatch) return;

  if (handMatch?.length === 1) {
    if (handMatch[0].length === 2) {
      inputLines[index].strength = "onePair";
      inputLines[index].matches = handMatch;
    }

    if (handMatch[0].length === 3) {
      inputLines[index].strength = "threeOfAKind";
      inputLines[index].matches = handMatch;
    }

    if (handMatch[0].length === 4) {
      inputLines[index].strength = "fourOfAKind";
      inputLines[index].matches = handMatch;
    }

    if (handMatch[0].length === 5) {
      inputLines[index].strength = "fiveOfAKind";
      inputLines[index].matches = handMatch;
    }
  }

  if (handMatch.length === 2) {
    if (handMatch[0].length === 2 && handMatch[1].length === 2) {
      inputLines[index].strength = "twoPair";
      inputLines[index].matches = handMatch;
    } else {
      inputLines[index].strength = "fullHouse";
      inputLines[index].matches = handMatch;
    }
  }
});

// sort all the results by strength
const handRankingsByStrength = handStrengthRegexes
  .reverse()
  .map((strength) => {
    return inputLines.filter((line) => line.strength === strength);
  })
  .filter((arr) => arr.length);

// So, now I have to sort all of the results by strength and multiply them by their respective scores
// maybe I can push an object to an array that contains the score and the ranking?
const scores = [];
const rankedScoresSorted = handRankingsByStrength.map((ranking) => {
  if (ranking.length === 1) {
    scores.push({
      hand: ranking[0].hand,
      score: ranking[0].score,
    });
  } else {
    const sorted = ranking.sort((a, b) => {
      return (
        cardStrengths.indexOf(a.hand[0]) - cardStrengths.indexOf(b.hand[0]) ||
        cardStrengths.indexOf(a.hand[1]) - cardStrengths.indexOf(b.hand[1]) ||
        cardStrengths.indexOf(a.hand[2]) - cardStrengths.indexOf(b.hand[2]) ||
        cardStrengths.indexOf(a.hand[3]) - cardStrengths.indexOf(b.hand[3]) ||
        cardStrengths.indexOf(a.hand[4]) - cardStrengths.indexOf(b.hand[4])
      );
    });

    sorted.forEach((item) => {
      scores.push({
        hand: item.hand,
        score: item.score,
      });
    });
  }
});

const multiplied = scores.map((score, index) => {
  // console.log('multiplying', score.score, 'x', (index + 1))
  return score.score * (index + 1);
});

console.log(multiplied.reduce((acc, curr) => acc + curr));
// asign the rank when multiplying. index + 1