Enhancements to the proposal Set methods

[unadlib]

This is a proposal https://github.com/tc39/proposal-set-methods to add methods like union and intersection to JavaScript's built-in Set class.

It is currently at stage 4: it has been tc39/ecma262#3306. This repository is no longer active.

This would add the following methods:

• Set.prototype.intersection(other)
• Set.prototype.union(other)
• Set.prototype.difference(other)
• Set.prototype.symmetricDifference(other)
• Set.prototype.isSubsetOf(other)
• Set.prototype.isSupersetOf(other)
• Set.prototype.isDisjointFrom(other)

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With the support of the latest major browsers, it is necessary for Mutative to support it as well.

Check compatibility