in reply to Is there a reason to use "join" instead of just using the period?
My interpretation is that he knew he join command, but didn't know how to do interpolation. Maybe he was a C programmer who thought join would be faster than printf(). :-)
Knowing several ways to do things, you can choose one that best expresses your intentions.
As Occam said: Entia non sunt multiplicanda praeter necessitatem.
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