Associative array issue - oracle

Question

I have created an associative array, I understand it can be used different way of writing but however just need tips how to make this work. Currently when I compile this block I would receive no data found. Thank you!
DECLARE
TYPE type_state IS TABLE OF VARCHAR(50)
INDEX BY VARCHAR2(50);
tbl_state type_state;
lv_statecity1_txt VARCHAR2(30):= 'TAMPA';
lv_statecity2_txt VARCHAR2(30):= 'ATLANTA';
lv_statecity3_txt VARCHAR2(30):= 'NYC';
lv_cnt_num NUMBER(5) := 0;
BEGIN
tbl_state('FLORIDA') := lv_statecity1_txt;
tbl_state('GEORGIA') := lv_statecity2_txt;
tbl_state('New_York') := lv_statecity3_txt;
FOR i IN 1..tbl_state.count loop
IF tbl_state(i) IS NOT NULL THEN
LV_CNT_NUM := LV_CNT_NUM + 1;
dbms_output.put_line(tbl_state(i));
END IF;
END LOOP;
dbms_output.put_line('That''s it folks');
END;

Answer 1

tbl_state is a table of strings indexed by strings - passing in index values 1, 2, 3 (numbers) won't work.
It is true that array pairs are still ordered (first, second etc.), but accessing them in a loop is a bit more complicated. You will need a WHILE loop, and the index (I kept the name i to match your code as closely as possible) must be declared to be the same data type and length as the keys in the array.
DECLARE
TYPE type_state IS TABLE OF VARCHAR(50)
INDEX BY VARCHAR2(50);
tbl_state type_state;
lv_statecity1_txt VARCHAR2(30):= 'TAMPA';
lv_statecity2_txt VARCHAR2(30):= 'ATLANTA';
lv_statecity3_txt VARCHAR2(30):= 'NYC';
lv_cnt_num NUMBER(5) := 0; -- WHAT IS THIS FOR? NEEDED??
i varchar2(50); -- Notice this line
BEGIN
tbl_state('FLORIDA') := lv_statecity1_txt;
tbl_state('GEORGIA') := lv_statecity2_txt;
tbl_state('New_York') := lv_statecity3_txt;
i := tbl_state.first; -- And this line
while (i is not null) loop -- And this one
LV_CNT_NUM := LV_CNT_NUM + 1;
dbms_output.put_line(tbl_state(i));
i := tbl_state.next(i); -- And this one
END LOOP;
dbms_output.put_line('That''s it folks');
END;
/