How to use the property function with more that 3 parameters ?

Question

Hi, 
 I've found in an existing code application this function called with 5 parameters (please see below). 
 But the Appian documentation says that the Property function must have 3 parameters only. This code works, but throw an error in Design mode (exactly like the "if" function which can take more than 3 parameters). 
 How would you replace this code ? with additional if conditions ? 
 property( local!availabilityResponse, "body", "resources", "type", null ) Regards

Stefan Helzle · Accepted Answer

Following code allows you to drill down into a nested data structure. I called it deepIndex(). The rule inputs are all of the "any" type. 
 Use it like 
 rule!deepIndex(
 data: local!availabilityResponse,
 path: {"body", "resources", "type"},
 default: null
) 
 if(
 isnull(ri!path),
 ri!data,
 reduce(
 index(_,_,ri!default),
 ri!data,
 ri!path
 )
)

David G. · Answer

For anyone who is coming to this old post, the correct answer is to do this: 
 property( local!availabilityResponse, {"body", "resources", "type"}, {} ) 
 This will return the three fields when local!availabilityResponse is not null, or an empty list when it is.

How to use the property function with more that 3 parameters ?

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