Minimum Add to Make Parentheses Valid LeetCode solution in JavaScript

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var minAddToMakeValid = function (s) {
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  let stack = [];
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  let count = 0;
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  for (let i = 0; i < s.length; i++) {
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    let ch = s[i];
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    if (ch === "(") {
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      stack.push(ch);
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    } else {
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      let top = stack.pop();
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      if (top != "(") count++;
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    }
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  }
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  count += stack.length;
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  return count;
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};