== Why is this an issue?

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

[source,sql]
----
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

[source,sql]
----
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;
/
----


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Use a constant instead of hard-coding "n".


=== Parameters

.allowedExpressions
****

----
0,1
----

Comma-separated list of allowed magic numbers
****


'''
== Comments And Links
(visible only on this page)

=== relates to: S109

endif::env-github,rspecator-view[]