* 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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