This function is the CS equivalent of taking a sledgehammer to crack a nut. Base cases? Check. Recursion? Check. Unnecessarily complex ternary operator? Triple check!
The function handles 0 and 1 as base cases (0 is even, 1 is odd), but then goes completely off the rails with a recursive call that either subtracts OR adds 2 depending on whether n is positive. It's like writing a novel when "return n % 2 == 0" would do the job in one line.
The real cherry on top? This function will eventually reach a base case for any integer input, but at what cost? Your CPU fans are already spinning up in anticipation of the stack overflow.