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newlispfanclub.alh.net • View topic - case design
Page 1 of 1

case design

PostPosted: Mon Aug 22, 2016 2:12 pm
by ssqq

Re: case design

PostPosted: Wed Jun 05, 2019 8:42 am
by lyl
I meet this problem too, and has been waiting for answer!

Re: case design

PostPosted: Thu Jun 06, 2019 4:21 pm
by TedWalther
case doesn't evaluate the conditions. So if you call check-type 1, it compares Type to 1, and of course they aren't the same. If you called (check-type 'Type) it would work. Or if you changed the condition to (case x (1 (println "the type is Type"))) it would work.

As for the "why"? I don't know. Perhaps it is because that is how it normally is in LISP. Ancient tradition.

If you want the condition evaluated, you can use cond instead of case.