Find the Difference of Two Arrays LeetCode solution in JavaScript

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var findDifference = function (nums1, nums2) {
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  const s1 = new Set(nums1);
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  const s2 = new Set(nums2);
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  const a1 = [...s1].filter((x) => !s2.has(x));
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  const a2 = [...s2].filter((x) => !s1.has(x));
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  return [a1, a2];
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};