INTEGER del_var(SYMBOL name)
This function deletes the object variable pointed to by the argument name defined on the current object (it does not delete an instance of a variable). If the object variable is not defined on the current object, the error ~varnf is thrown. Upon successful execution del_var() returns 1.
add_var() | clear_var() | del_var() | get_var() | set_var() | variables()