Oracle example of MEMBER OF function

oracle_member_of_example.sql

create type typ_number_table IS TABLE OF NUMBER; 

declare
    ptyp_list    typ_number_table;
begin
    ptyp_list := typ_number_table();
    ptyp_list.extend;
    ptyp_list(ptyp_list.last) := 88;
    ptyp_list.extend;
    ptyp_list(ptyp_list.last) := 90;
    
    if (1 member of ptyp_list) then
        DBMS_OUTPUT.put_line ('not ok');
    else 
        DBMS_OUTPUT.put_line ('ok');
    end if;
    if (2 member of ptyp_list) then
        DBMS_OUTPUT.put_line ('not ok');
    else 
        DBMS_OUTPUT.put_line ('ok');
    end if;    
    if (88 member of ptyp_list) then
        DBMS_OUTPUT.put_line ('ok');
    else 
        DBMS_OUTPUT.put_line ('not ok');
    end if;
    if (90 member of ptyp_list) then
        DBMS_OUTPUT.put_line ('ok');
    else 
        DBMS_OUTPUT.put_line ('not ok');
    end if;
   
end;