Kth Distinct String in an Array LeetCode solution in JavaScript

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var kthDistinct = function (arr, k) {
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  const map = {}; // used for arr occurences
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  const distinctArr = []; // store the distinct values (only appearing once)
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  // increment the occurence to the map
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  arr.forEach((letter) => (map[letter] = map[letter] + 1 || 1));
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  // store all the distinct values in order
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  for (let [key, val] of Object.entries(map))
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    if (val == 1) distinctArr.push(key);
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  // return the key or empty string
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  return distinctArr[k - 1] || "";
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};
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~``;