Re: [gambit-list] (case)

On 31-Oct-08, at 9:48 AM, Christoph Bauer wrote:

thanks for all the responses in the string->number thread. I have another question: what is the correct result of

(case ".ab" ((".ab") 1) (else 2))

Indeed gsi gives another answer as scheme48. (maybe eq? vs equal?)

Case uses eqv? to compare the keys, and given that here (eqv? ".ab" ".ab") is normally #f, the else clause is executed. Note that (eqv? ".ab" ".ab") could be #t if compiled by a compiler that merges constants (Scheme48 seems to do this and Gambit used to do this, and may in the future). In any case in Scheme (eqv? ".ab" ".ab") is either #t or #f.

Marc