TL;DR: JavaScript’s Set data structure has added 7 new APIs that are very useful and can reduce the need for libraries like lodash. They are:
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.
1. Set.prototype.intersection()
The intersection() method of Set instances takes a set and returns a new set containing elements in both this set and the given set.
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2. Set.prototype.union()
The union() method of Set instances takes a set and returns a new set containing elements which are in either or both of this set and the given set.
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Example:
3. Set.prototype.difference()
The difference() method of Set instances takes a set and returns a new set containing elements in this set but not in the given set.
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Example:
4. Set.prototype.symmetricDifference()
The symmetricDifference() method of Set instances takes a set and returns a new set containing elements which are in either this set or the given set, but not in both.
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Example:
5. Set.prototype.isSubsetOf()
The isSubsetOf() method of Set instances takes a set and returns a boolean indicating if all elements of this set are in the given set.
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Example:
6. Set.prototype.isSupersetOf()
The isSupersetOf() method of Set instances takes a set and returns a boolean indicating if all elements of the given set are in this set.
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Example:
7. Set.prototype.isDisjointFrom()
The isDisjointFrom() method of Set instances takes a set and returns a boolean indicating if this set has no elements in common with the given set.
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Example:
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