Minimum Number of Buckets Required to Collect Rainwater from Houses LeetCode solution in JavaScript

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var minimumBuckets = function (street) {
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  const n = street.length;
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  const chars = street.split("");
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  let count = 0;
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  for (let i = 0; i < n; ++i) {
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    const char = chars[i];
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    if (char === "H") {
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      if (i > 0 && chars[i - 1] === "B") {
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        continue;
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      } else if (i < n - 1 && chars[i + 1] === ".") {
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        ++count;
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        chars[i + 1] = "B";
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      } else if (i > 0 && chars[i - 1] === ".") {
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        ++count;
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        chars[i - 1] = "B";
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      } else {
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        return -1;
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      }
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    }
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  }
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  return count;
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};