Docs / Utility
IIF is an AMPscript function in the utility category. Both branches are evaluated.
IIF(condition, ifTrue, ifFalse)
%%=IIF(Empty(FirstName), "friend", FirstName)=%%
Ada
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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IIF in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.