Safe navigation operator in Groovy

Question

I use safe navigation operator to avoid NPEs like this

myInstance?.field1
myInstance?.field2
myInstance?.field3

To convert the code above in for loop i wrote

<g:each var="i" in="${ (1..<4 }">
    myInstance['field'+i]
</g:each>

How do I use the safe navigation operator on above code when I am retrieving values in hashmap format?
I looked into docs here but it does not have a similar example.

Answer 1

I would use this syntax:

myInstance?."field$i"

Answer 2

You could do:

<g:each var="i" in="${ (1..<4 }">
    ${myInstance?."field$i"}
</g:each>

Or, probably better (and neater in your code) would be to make this a tag and do it as you would above inside the pure groovy tag.