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5.3.6 Type Predicates

Each type has a corresponding predicate which defines the objects which are members of that type. Each predicate function has a single parameter, if that parameter is of the correct type it returns true.

integerp, numberp, null, consp, listp, vectorp, subrp, functionp, sequencep, stringp, symbolp, processp, filep.

The documentation for these functions is with the documentation for the relevant type.