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26.3 Conditional Evaluation of a Sequence of Expressions
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`and' and `or' evaluate all their arguments, similar to `begin', but
evaluation stops as soon as one of the expressions evaluates to false
or true, respectively.
-- syntax: and expr ...
Evaluate the EXPRs from left to right and stop evaluation as soon
as one expression evaluates to `#f'; the remaining expressions are
not evaluated. The value of the last evaluated expression is
returned. If no expression evaluates to `#f', the value of the
last expression is returned.
If used without expressions, `#t' is returned.
-- syntax: or expr ...
Evaluate the EXPRs from left to right and stop evaluation as soon
as one expression evaluates to a true value (that is, a value
different from `#f'); the remaining expressions are not evaluated.
The value of the last evaluated expression is returned. If all
expressions evaluate to `#f', `#f' is returned.
If used without expressions, `#f' is returned.
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