or -- r7rs Definition

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Kind

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syntax;

Implemented by

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• or (from vonuvoli);

Syntax signature

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Syntax keywords:

• expression: expression;

Syntax variants:

• (_)
• (_ expression |...|)

Exports

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• scheme:base -- (scheme base);

Exports recursive

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• scheme -- (scheme);

Description

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(or <test_1> ...)

Semantics: The <test> expressions are evaluated from left to right, and the value of the first expression that evaluates to a true value (see section on booleans) is returned. Any remaining expressions are not evaluated. If all expressions evaluate to #f or if there are no expressions, then #f is returned.

(or (= 2 2) (> 2 1))            ===>  #t
(or (= 2 2) (< 2 1))            ===>  #t
(or #f #f #f) ===>  #f
(or (memq 'b '(a b c))
    (/ 3 0))                    ===>  (b c)

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