Oracle PL/SQL: Dealing with table-type variables with Discontinuous index

Test code:

1. DECLARE
2. TYPE list_of_names_t is table of VARCHAR2 (100) index by PLS_INTEGER;
3. Happyfamily list_of_names_t;
4. Rochelle row PLS_INTEGER;
5. BEGIN
6. -- Build table data which indexIsNot consecutive.
7. Happyfamily (2020202020): ='Lil';
8. Fig (-15070): ='Steven';
9. Fig (-90900): ='Chris';
10. Fig (-90899): ='Chris90899';
11. Happyfamily (88): ='Veva';
13. <Err1>
14. BEGIN
15. Dbms_output.put_line ('======= Err1 ========');
16. -- IIsStarting from 1 and increase one by one.
17. FOR I IN 1 .. happyfamily. COUNT
18. LOOP
19. Dbms_output.put_line (I );
20. Dbms_output.put_line (happyfamily (I ));
21. End loop;
22. EXCEPTION
23. WHEN OTHERS THEN
24. Dbms_output.put_line ('Err1 =>'| SQLERRM );
25. END;
27. <Err2>
28. BEGIN
29. Dbms_output.put_line ('======= Err2 ========');
30. -- IIsStarting from-90900 and increase one by one.
31. FOR I IN happyfamily. FIRST... happyfamily. LAST
32. LOOP
33. Dbms_output.put_line (I );
34. Dbms_output.put_line (happyfamily (I ));
35. End loop;
36. EXCEPTION
37. WHEN OTHERS THEN
38. Dbms_output.put_line ('Err2 =>'| SQLERRM );
39. END;
41. <Pass>
42. BEGIN
43. Dbms_output.put_line ('======= Pass ========');
44. -- IIsStarting from-90900 and increase discrete
45. Rochelle row: = happyfamily. FIRST;
46. WHILE (l_row is not null)
47. LOOP
48. Dbms_output.put_line (l_row );
49. Dbms_output.put_line (happyfamily (l_row ));
50. Rochelle row: = happyfamily. NEXT (Rochelle row );
51. End loop;
52. EXCEPTION
53. WHEN OTHERS THEN
54. Dbms_output.put_line ('Err3 =>'| SQLERRM );
55. END;
56. END;

Output:

1. ======= Err1 ========
2. 1
3. ORA-01403: no data found
4. ======= Err2 ========
5. -90900
6. Chris
7. -90899
8. Chris90899
9. -90898
10. Err2 => ORA-01403: no data found
11. ======= Pass ========
12. -90900
13. Chris
14. -90899
15. Chris90899
16. -15070
17. Steven
18. 88
19. Veva
20. 2020202020
21. Eli