find the kth most common element in an array in typescript

index.ts
function findKthMostCommon(arr: number[], k: number): number | undefined {
  // Create a dictionary to count the occurrences of each element in the array
  const dict: Record<number, number> = {};
  arr.forEach(num => {
    dict[num] = dict[num] ? dict[num] + 1 : 1;
  });

  // Convert the dictionary into an array of [key, value] pairs
  const pairs = Object.entries(dict);

  // Sort the pairs array by descending order of values (occurrence counts)
  pairs.sort((pairA, pairB) => {
    return pairB[1] - pairA[1];
  });

  // Return the value of the kth most common element
  if (pairs[k - 1]) {
    return parseInt(pairs[k - 1][0]);
  } else {
    return undefined;
  }
}
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