> I wrote about this in 2015
> http://alejandromp.com/blog/2015/6/24/swift-flatmap/
> <http://alejandromp.com/blog/2015/6/24/swift-flatmap/> and forgot about
> it.
That text has a line which illustrates the source of dissent:
> It’s kind of combining map (to apply the function), flatten (to unwrap the
> optionals) and filter (to remove the nils)
I’m saying this isn’t true, because after the flatten step, there are no
Optionals left, and thus, there can be no nils at all (unless we startet with
Optional<Optional<T>>…)
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