Maximum Difference Between Increasing Elements LeetCode solution in JavaScript

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var maximumDifference = function (nums) {
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  var diff = -1;
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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 (nums[j] > nums[i]) diff = Math.max(nums[j] - nums[i], diff);
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    }
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  }
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  return diff;
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};