New JavaScript Set methods | MDN Blog
intersection()returns a new set with elements in both this set and the given set.union()returns a new set with all elements in this set and the given set.difference()returns a new set with elements in this set but not in the given set.symmetricDifference()returns a new set with elements in either set, but not in both.isSubsetOf()returns a boolean indicating if all elements of a set are in a specific set.isSupersetOf()returns a boolean indicating if all elements of a set are in a specific set.isDisjointFrom()returns a boolean indicating if this set has no elements in common with a specific set.
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