rspec/rules/S2480/plsql/rule.adoc

Hard-coding bounds in FOR loops is a bad practice, just as magic numbers in general are. Often, those magic bounds can be replaced by dynamic values. If that is not possible, replacing the literal number with a constant is still better.

== Noncompliant Code Example

----
SET SERVEROUTPUT ON

DECLARE
  TYPE myCollectionType IS VARRAY(3) OF VARCHAR2(42);
  myCollection myCollectionType := myCollectionType('David', 'John', 'Richard');

BEGIN

  FOR i IN 2 .. 3 -- Noncompliant; magic numbers used for the loop bounds
  LOOP
    DBMS_OUTPUT.PUT_LINE('name = ' || myCollection(i));
  END LOOP;

  FOR i IN 2 .. myCollection.LAST -- Noncompliant, better but still magic
  LOOP
    DBMS_OUTPUT.PUT_LINE('name = ' || myCollection(i));
  END LOOP;

END;
/
----

== Compliant Solution

----
SET SERVEROUTPUT ON

DECLARE
  TYPE myCollectionType IS VARRAY(3) OF VARCHAR2(42);
  myCollection myCollectionType := myCollectionType('David', 'John', 'Richard');

BEGIN
  FOR i IN myCollection.FIRST .. myCollection.LAST
  LOOP
    DBMS_OUTPUT.PUT_LINE('name = ' || myCollection(i));
  END LOOP;
END;
/
----