Count Number of Pairs With Absolute Difference K LeetCode solution in JavaScript

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var countKDifference = function (nums, k) {
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  nums = nums.sort((b, a) => b - a);
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  let count = 0;
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  for (let i = 0; i < nums.length; i++) {
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    for (let j = i + 1; j < nums.length; j++) {
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      if (Math.abs(nums[i] - nums[j]) == k) {
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        count++;
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      }
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    }
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  }
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  return count;
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};