8.1 Procedures

The module Procedure specifies operations on procedures.

IsProcedure

{Procedure.is +X ?B}

tests whether X is a procedure.

ProcedureArity

{Procedure.arity +P ?I}

returns the procedure arity of P, i. e., the number of arguments which P takes.

apply

{Procedure.apply +P +Xs}

applies the procedure P to the arguments given by the elements of the list Xs, provided that

{Procedure.arity P} == {Length Xs}