Ask HN: What piece of code/codebase blew your mind when you saw it?

[Hacker News]

Mine was when I learned a subset of recursion called mutual recursion. It was for a pair of function to determine if a number was odd or even.
(define (odd? x)

  (cond


    [(zero? x) #f]


    [else (even? (sub1 x))]))

(define (even? x)

  (cond


    [(zero? x) #t]


    [else (odd? (sub1 x))]))

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Comments URL: https://news.ycombinator.com/item?id=33413124

Points: 10

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