Number of Visible People in a Queue LeetCode solution in JavaScript

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/**
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 * @param {number[]} heights
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 * @return {number[]}
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 */
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var canSeePersonsCount = function (heights) {
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  const stack = [];
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  const answer = new Array(heights.length).fill(0);
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  for (let i = 0; i < heights.length; i++) {
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    while (stack.length && heights[i] > heights[stack[stack.length - 1]]) {
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      answer[stack.pop()]++;
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    }
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    if (stack.length) {
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      answer[stack[stack.length - 1]]++;
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    }
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    stack.push(i);
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  }
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  return answer;
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};