# [plt-scheme] Is there a set data-type?

2010/2/5 Laurent <laurent.orseau at gmail.com>
>* Does something like this sounds interesting and generalizable for infinite
*>* sets?
*>* Mixing hashes on finite sets for speed and recurrence for infinite sets in
*>* the default case (trivial example):
*>*
*>* (define h (make-hash))
*>*
*>* (for-each (λ(n)(hash-set! h n #t))
*>* '(0 2 4 6 8)) ; could be a lot larger of course
*>*
*>* (define (odd? n)
*>*
*[...]
This is odd... Is it even possible to make so many mistakes in one day??
>* [...]
*>* > (even? 9876)
*>* #t
*>* > (even? 9877)
*>* #f
*>*
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