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But the `Set` was completely new. And things like union and intersection are basic features and without it the `Set` thing is almost useless, so it wouldn't make any sense to remove they in the future as much as it didn't make sense to not include them now.

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I agree with you but there are ways to perform union and intersection with existing APIs.

http://2ality.com/2015/01/es6-set-operations.html

> Long-term, I expect JavaScript to have built-in functionality for this, e.g. via functions that operate on iterables

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