Bulls and Cows LeetCode solution in JavaScript

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var getHint = function (secret, guess) {
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  let ACount = 0,
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    BCount = 0;
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  const secretMap = new Map(),
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    guessMap = new Map();
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  for (let i = 0; i < secret.length; i++) {
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    if (secret[i] == guess[i]) {
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      ACount++;
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    } else {
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      if (secretMap.has(secret[i])) {
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        secretMap.set(secret[i], secretMap.get(secret[i]) + 1);
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      } else {
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        secretMap.set(secret[i], 1);
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      }
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    }
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  }
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  for (let i = 0; i < guess.length; i++) {
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    if (secret[i] !== guess[i]) {
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      if (secretMap.get(guess[i]) > 0) {
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        secretMap.set(guess[i], secretMap.get(guess[i]) - 1);
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        BCount++;
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      }
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    }
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  }
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  return ACount + "A" + BCount + "B";
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};