Stop the loop if a value is found

Question

For a list of integers, I need to check the desired value by calling a service. I would like to stop calling the service, only I get the desired output. Any suggestions, please.

Mike Schmitt · Accepted Answer

This could potentially be one of the few times that it's helpful to call an expression rule recursively. 
 Pattern: rule!RULE_myFunction(list of integers) 
 if( (list index 1 meets condition), [Return Value], rule!RULE_myFunction(ldrop(list of integers, 1)) /* pass in the same array, but with the first element removed */ )

Stefan Helzle · Answer

In Appian there is only a foreach(). And this cannot be interrupted. 
 But using the reduce() function, while still iterating on all list items, you can decide whether to call your service based on previous results. 
 https://appian.rocks/2022/08/29/complex-algorithms-in-appian/

Soma · Answer

There is no break concept in Appian. 
 But using reduce, call the service for list of integers. For every iteration append the desired output to a list and check if the list contains your desired output. If the list contains the output just return null instead of calling the service.

Stop the loop if a value is found

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