[swift-users] how to create an array by adding/removing from another array?

[Jens Alfke]

> On Aug 24, 2016, at 7:07 AM, Jean-Denis Muys via swift-users <swift-users at swift.org> wrote:
> 
> However I was wondering if it was possible (preferable?) to do it in a more “functional” style.

Apple’s Foundation framework has Array.arrayByAddingObject (but not ByRemoving).

However, this would not be preferable (at least in performance) due to all the copying. Performance of appending n items would be O(n^2), for instance, vs. O(n) for appending in-place.

—Jens
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