boolean? -- r7rs Definition

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Kind

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type-predicate;

Extended by

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• boolean? (from vonuvoli);

Procedure signature

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Procedure variants:

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

Exports

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• scheme:base -- (scheme base);

Exports recursive

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• scheme -- (scheme);

Description

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(boolean? obj)

The boolean? predicate returns #t if obj is either #t or #f and returns #f otherwise.

(boolean? #f)         ===>  #t
(boolean? 0)          ===>  #f
(boolean? '())        ===>  #f

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

Referenced-types

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• boolean;
• true;
• any;
• false;