[JS] Easy set  find difference
\nvar findDifference = function(nums1, nums2) {\n    const s1 = new Set(nums1);\n    const s2 = new Set(nums2);\n    \n    const a1 = [...s1].filter(x => !s2.ha
```\nvar findDifference = function(nums1, nums2) {\n    const s1 = new Set(nums1);\n    const s2 = new Set(nums2);\n    \n    const a1 = [...s1].filter(x => !s2.has(x));\n    const a2 = [...s2].filter(x => !s1.has(x));\n    \n    return [a1, a2];\n};\n```
['Ordered Set', 'JavaScript']