Which code snippet will correctly replace invalid emails in a list using the MAIL_isValidEmail() rule?

Which code snippet will correctly replace invalid emails in a list using the MAIL_isValidEmail() rule?

• A. a!forEach( Items: ri!inputValues, expression: if( rule!MAIL_isValidEmail(email: fv!item), fv!item, "invalid" ) )
• B. a!forEach( Items: ri!inputValues, expression: if( rule!MAIL_isValidEmail(email: fv!item), "invalid", fv!item ) )
• C. a!forEach( Items: ri!inputValues, expression: if( rule!MAIL_isValidEmail(email: fv!item) = true, fv!item, "invalid" ) )
• D. a!forEach( Items: ri!inputValues, expression: if( not(rule!MAIL_isValidEmail(email: fv!item)), fv!item, "invalid" ) )

Answer: (A)

The main idea is to apply a validation rule to each email in the list and replace only the invalid ones, keeping valid emails as they are. For each item, you test the email with MAIL_isValidEmail. If the rule returns true (the email is valid), you return the original value; if it returns false, you substitute the string "invalid". This is exactly what the correct snippet does: it checks the rule, and on true it yields the current email, on false it yields "invalid". The other ways would invert the behavior—for example, replacing valid emails with "invalid" or keeping invalid ones unchanged—and one variant uses an unnecessary explicit comparison to true, which is less clean than using the boolean result directly.

The main idea is to apply a validation rule to each email in the list and replace only the invalid ones, keeping valid emails as they are. For each item, you test the email with MAIL_isValidEmail. If the rule returns true (the email is valid), you return the original value; if it returns false, you substitute the string "invalid". This is exactly what the correct snippet does: it checks the rule, and on true it yields the current email, on false it yields "invalid". The other ways would invert the behavior—for example, replacing valid emails with "invalid" or keeping invalid ones unchanged—and one variant uses an unnecessary explicit comparison to true, which is less clean than using the boolean result directly.