generate-average-ranks.js

const RANKS_WEIGHTS = {
  'Iron 1': 1,
  'Iron 2': 2,
  'Iron 3': 3,
  'Bronze 1': 4,
  'Bronze 2': 5,
  'Bronze 3': 6,
  'Silver 1': 7,
  'Silver 2': 8,
  'Silver 3': 9,
  'Gold 1': 10,
  'Gold 2': 11,
  'Gold 3': 12,
  'Platinum 1': 13,
  'Platinum 2': 14,
  'Platinum 3': 15,
  'Diamond 1': 16,
  'Diamond 2': 17,
  'Diamond 3': 18,
  'Immortal 1': 19,
  'Immortal 2': 20,
  'Immortal 3': 21,
  Radiant: 22,
};

const WEIGHTS_RANKS = {
  1: 'Iron 1',
  2: 'Iron 2',
  3: 'Iron 3',
  4: 'Bronze 1',
  5: 'Bronze 2',
  6: 'Bronze 3',
  7: 'Silver 1',
  8: 'Silver 2',
  9: 'Silver 3',
  10: 'Gold 1',
  11: 'Gold 2',
  12: 'Gold 3',
  13: 'Platinum 1',
  14: 'Platinum 2',
  15: 'Platinum 3',
  16: 'Diamond 1',
  17: 'Diamond 2',
  18: 'Diamond 3',
  19: 'Immortal 1',
  20: 'Immortal 2',
  21: 'Immortal 3',
  22: 'Radiant',
};

const getAverageRank = (ranks) =>
  Math.round(
    ranks.reduce(
      (total, currentRank) => RANKS_WEIGHTS[currentRank] + total,
      0
    ) / ranks.length
  );

const setUnrankedRanks = (ranks) => {
  const unrankeds = ranks.filter((rank) => rank === '?');
  const rankeds = ranks.filter((rank) => rank !== '?');

  unrankeds.forEach(() => {
    rankeds.push(WEIGHTS_RANKS[getAverageRank(rankeds)]);
  });

  return rankeds;
};

const getDetailedAverageRank = ({ allies, enemies }) => {
  const normalizedAllies = setUnrankedRanks(allies);
  const normalizedEnemies = setUnrankedRanks(enemies);

  const alliesAverageRank = getAverageRank(normalizedAllies);
  const enemiesAverageRank = getAverageRank(normalizedEnemies);
  const matchAverageRank = getAverageRank([
    ...normalizedAllies,
    ...normalizedEnemies,
  ]);

  return {
    allies: WEIGHTS_RANKS[alliesAverageRank],
    enemies: WEIGHTS_RANKS[enemiesAverageRank],
    match: WEIGHTS_RANKS[matchAverageRank],
  };
};

Instructions

Allies and enemies should be listed as mentioned in here. Unranked players should be listed as '?'.

Usage

• Copy all the code in generate-average-ranks.js
• Hit F12 to open browser console and paste it. (can be used in node repl too)
• Follow the pattern below:

getDetailedAverageRank({
    allies: ['?', 'Platinum 2', 'Platinum 3', 'Platinum 3', 'Gold 2'],
    enemies: ['Platinum 2', 'Diamond 1', 'Diamond 3', 'Gold 2', 'Diamond 1'],
});