A function that calls itself sounds like a paradox. It's actually just a careful way of saying "do the same thing on a smaller problem, and know when to stop."
Why [] + [] is an empty string, why 0.1 + 0.2 is not 0.3, and why none of this means JavaScript is a bad first language.
Containers explained without the whale metaphors, plus a small Dockerfile you can actually copy.
INNER, LEFT, RIGHT and FULL joins, explained by who gets lunch when the team orders food and who gets left staring at a sad desk salad.
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