HTML Entity Parser LeetCode solution in JavaScript

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/**
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 * @param {string} text
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 * @return {string}
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 */
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var entityParser = function (text) {
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  const entityMap = {
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    """: `"`,
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    "'": `'`,
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    "&": `&`,
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    ">": `>`,
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    "&lt;": `<`,
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    "&frasl;": `/`,
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  };
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  (stack = []), (entity = "");
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  for (const char of text) {
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    stack.push(char);
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    if (char == "&") {
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      if (entity.length > 0) entity = "";
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      entity += char;
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    } else if (char == ";" && entity.length > 0) {
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      entity += char;
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      if (entity in entityMap) {
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        while (stack.length && stack[stack.length - 1] !== "&") {
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          stack.pop();
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        }
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        stack.pop();
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        stack.push(entityMap[entity]);
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      }
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      entity = "";
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    } else if (entity.length > 0) {
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      entity += char;
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    }
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  }
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  return stack.join("");
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};