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- // difference
- let difference = arr1.filter(x => arr2.indexOf(x) == -1);
- // symmetric difference
- let difference = arr1
- .filter(x => arr2.indexOf(x) == -1)
- .concat(arr2.filter(x => arr1.indexOf(x) == -1));
- // intersection
- let intersect = arr1.filter(n => arr2.indexOf(n) > -1);
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