difference between Property & index function?

Question

What is the key difference between the property() & index() function?Can anybody tell?

Mike Schmitt · Answer

Both functions do the same thing in the same way, as is (vaguely) noted in the documentation. 
 However, I strongly recommend as a Best Practice, to use them separately, as follows: 
 
 property() when looking up i.e. a dot property of a CDT or Dictionary, as in property(ri!myCdt, "userId", null()) to try to get the "userId" dot property 
 index() when looking up an array index, as in index(ri!myArray, 5, null()) to try to find the 5th member of the array, and if the array isn't that long, return null. 
 
 This is most important to me since it makes it dramatically easier to read through code afterwards if you're not having to guess whether this "index()" call is trying to find a property or an array index, which can get pretty messy especially when the functions are nested.

Robert Shankin · Answer

Details on each of are provided in Appian documentation: 
 
 fn!property() 
 fn!index()

difference between Property & index function?

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