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I think it speaks more to the author's prowess, not to the fantastic magic powers of Apple's latest walled garden.

Any up-to-date C# developer already knows Swift.

Any up-to-date Java developer already knows Swift :)

Any up-to-date Swift developer already knows Swift :-p

But the code was just a port/convert, seems relatively non-trivial to do that in 4 hours.

I supposed "relatively" is the key word here. To me, that'd be a great feat. To others, not that special.