Don't get what you want to say?

[1].sameStructureAs([1])
true

This solution does not work correctly. If we use the option [1].sameStructureAs([1]), it will return false.

It's really nice to see what I could have done better. For one, it's clever that you made the function itself recursive, I created a new recursive function. Also, interesting to see how you return false if they aren't the same length which seems so obvious but went over my head.

Thanks for the example case, I think I misread the if/else logic the first time round. Much appreciated!

This is for this case

Test.expect(![1,1].sameStructureAs([[2,2],2]), "[1,1] not same as [[2,2],2]");

without the else your solution returns true

In the description the example shows that the motto is lower case but the tests expects them how where provided.