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So you're telling me that adding the string 'b' to 'a' twice, then adding 'a' twice more, and calling toLowerCase() somehow produces "banana"? Yeah, that tracks. JavaScript's type coercion is basically that friend who always "helps" by making things infinitely more confusing.
Here's what's happening: 'b' + 'a' gives you "ba". Then + + converts the next 'a' to NaN (because unary plus on a string that's not a number = NaN). "ba" + NaN = "baNaN". Add another 'a' and you get "baNaNa". Call toLowerCase() and boom—"banana". It's like JavaScript is gaslighting you into thinking this makes sense.
The real question is: who discovered this, and what were they doing at 3 AM to stumble upon it?
