definedP

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Workspace Management

Workspace Predicates

PrimitiveP

NameP

definedP name
defined? name


outputs TRUE if the input is the name of a user-defined procedure, including a library procedure. (However, Logo does not know about a library procedure until that procedure has been invoked.)

Examples:

defined? "fd ;false ;-) defined? "tree ;false ;-) tree defined? "tree ;true ;-)

PrimitiveP

NameP