pair? -- r7rs Definition

§

Kind

§

type-predicate;

Extended by

§

• pair? (from vonuvoli);

Procedure signature

§

Procedure variants:

• ((pair) -> (true))
  • input: a value of type pair;
  • output: a value of type true;
• ((null) -> (false))
  • input: a value of type null;
  • output: a value of type false;
• ((any) -> (false))
  • input: a value of type any;
  • output: a value of type false;

Exports

§

• scheme:base -- (scheme base);

Exports recursive

§

• scheme -- (scheme);

Description

§

(pair? obj)

The pair? predicate returns #t if obj is a pair, and otherwise returns #f.

(pair? '(a . b))        ===>  #t
(pair? '(a b c))        ===>  #t
(pair? '())             ===>  #f
(pair? '#(a b))         ===>  #f

---

The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

§

• pair;
• true;
• null;
• false;
• any;