IF CONDITION WITH MORE THAN 3 PARAMETERS

Question

Hi Appian Gurus, 
 
 I recently came across a code like this :

I noticed that using the If() function with more than three parameters works like a nested If condition. However, I couldn&rsquo;t find any documentation about this behavior in Appian&rsquo;s official documentation. Is it acceptable to use the If function in this way?

Alberto Cortés · Accepted Answer

You're absolutely right &mdash; the if() function in Appian does support more than three parameters and behaves like a multi-branch conditional. It evaluates each condition in order and returns the result of the first condition that evaluates to true . If none of the conditions are true, it returns the final default value. 
 Even though this usage is not explicitly documented in Appian&rsquo;s official function reference, it is fully supported by the platform and commonly used by many developers in the community. It&rsquo;s essentially a cleaner alternative to deeply nested if() statements. 
 That said, if you&rsquo;re working with more complex logic or want better readability, especially with 3+ conditions, it&rsquo;s worth considering the a!match() function (available from Appian 22.4 onward), which is officially documented and designed for multi-condition logic. if(
 condition1, result1,
 condition2, result2,
 condition3, result3,
 ...,
 defaultResult
)

lqprth · Answer

We have also used the if function with multiple parameters; however, during our code review with Appian before go-live, it was recommended to avoid using undocumented features since they can be deprecated at any time without prior notice. Additionally, such implementations might not be flagged by Appian design tools like the expression editor or health check, potentially leading to unnoticed issues or future compatibility problems. Therefore, it is advisable to use a!match() or choose() when handling multiple conditions.

Stefan Helzle · Answer

I do not allow this in my teams. There are many edge cases where this does not work anymore. Use a!match instead.

IF CONDITION WITH MORE THAN 3 PARAMETERS

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