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Re:Bundle Phobia: find the cost of adding an npm package to ... by styfle on Monday December 18, 2017 @09:38PM (#15957307)
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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