Best Poker Hand LeetCode solution in JavaScript

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var bestHand = function (ranks, suits) {
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  let suitsMap = {};
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  for (let i = 0; i < suits.length; i++) {
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    if (suitsMap[suits[i]]) {
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      suitsMap[suits[i]]++;
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    } else {
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      suitsMap[suits[i]] = 1;
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    }
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  }
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  if (Object.keys(suitsMap).length === 1) return "Flush";
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  let pair = false;
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  let ranksMap = {};
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  for (let i = 0; i < ranks.length; i++) {
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    if (ranksMap[ranks[i]]) {
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      ranksMap[ranks[i]]++;
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      if (ranksMap[ranks[i]] >= 3) return "Three of a Kind";
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    } else {
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      ranksMap[ranks[i]] = 1;
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    }
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  }
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  if (Object.keys(ranksMap).length === 5) return "High Card";
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  return "Pair";
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};