outportp

outportp( 
g_obj 
) 
=> t / nil

Checks if an object is an output port.

An output port may be closed, so if outportp returns t, that does not guarantee a successful write to the port.

g_obj

Any SKILL object.

`t`	The given object is an output port.
`nil`	The given object is not an output port.

(outportp poport)    
=> t
(outportp piport)    
=> nil
(outportp 123)       
=> nil