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A couple of operations are built into the virtual machine for performing
tests efficiently. These functions return either nil
for false or
(nil,nil)
for true, and are useful for example as a predicate
p
in programs of the form
conditional(p,(f,g))
among other things. In
this example, the predicate is applied to the argument, a result of
(nil,nil)
causes f
to be applied to it, and a result
of nil
causes g
to be applied to it.
2.7.11.1 Compare | ||
2.7.11.2 Member |
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