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Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: "B. Pym" <Nobody447095@here-nor-there.org> Newsgroups: comp.lang.lisp Subject: Re: I still don't get MAPCAN Date: Thu, 26 Jun 2025 23:32:38 -0000 (UTC) Organization: A noiseless patient Spider Lines: 9 Message-ID: <103klal$3nt25$1@dont-email.me> References: <103kjvg$3nlhj$1@dont-email.me> Injection-Date: Fri, 27 Jun 2025 01:32:39 +0200 (CEST) Injection-Info: dont-email.me; posting-host="74514f8c2681eea7854c9c7eb7c18eb9"; logging-data="3929157"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19XjAXDJ6O1/RS7k73s+ZY4" User-Agent: XanaNews/1.18.1.6 Cancel-Lock: sha1:Vvn8CE1K0O+9r0M2OaGeH1CmjX0= B. Pym wrote: > (mapcan (lambda (e) (if (interestingp e) (list e) nil)) huge-list)) Shorter: (mapcan (lambda (e) (and (interestingp e) (list e))) huge-list))