AMP Script Difficulty

Question

What would be the correct script for the following?

%%FieldName%%, fallback = no information available

Answer 1

This is how I would approach it:

%%[

var @fieldName 
set @fieldName = AttributeValue("fieldName")

if not empty(@fieldName) then
]%%

%%=v(@fieldName)=%%

%%[ else ]%%

no information available

%%[ endif ]%%

or in a single block:

%%[

var @fieldName 
set @fieldName = AttributeValue("fieldName")

if not empty(@fieldName) then

  output(concat(@fieldName))

else 

  output("no information available")

endif 
]%%

or shorter:

%%=iif(empty(AttributeValue("fieldName"), "no information available", AttributeValue("fieldName")))=%%

Using raw personalization strings is risky, IMO. If fieldname didn't exist in your send context for some reason, the email would blow up. Using AttributeValue() will return an empty string in that case.

Answer 2

%%[ var @this set @this = FieldName]%% 
%%[IF @this == "" or @this is NULL THEN]%% 
some text here to signify that it's blank 
%%[ELSE]%% %%FieldName%%, 
%%[ENDIF]%%

Taken from: https://help.salesforce.com/articleView?id=000213691&type=1