Thank you, Christian. On Mon, Dec 10, 2018 at 12:36 PM Christian Kellermann <ck...@pestilenz.org> wrote:
> * Paul Sika <p...@ponguibou.com> [181210 13:27]: > > hi Thomas, > > thank you very much. it is indeed clear from your explanation. it is > about > > the cons cells. > > > > But i must say that at the back of the mind it feels like it should not > > satisfy pair? because there are 3 elements in the list. > > Well, it satisfies pair? since the first cell *is* a pair. The cdr > of the pair just points to another pair... > > pair? makes a nice check for recursive procedures as the empty list > is not a pair: (pair? '()) -> #f > > This avoids checking for list? and null? > > > -- > May you be peaceful, may you live in safety, may you be free from > suffering, and may you live with ease. >
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