I thought about AoA, but that is not enought. For example:

[1,2,3,4,5,6,7,8,9]

should be converted to something like this:

[1,[2,3,4],5,[6,[7,8,9]]]

What is missing in this structure is the placeholder, which will have a group name... that's a new value in the list!

I guess that I could manage the first element in each list as the name of the placeholder, resulting something like this:

[A,1,[B,2,3,4],5,[C,6,[D,7,8,9]]]

BTW, while traversing, how could I recognize if current element is a scalar or another list to recurse?

In reply to Re^2: How might I handle a special tree? by vitoco
in thread How might I handle a special tree? by vitoco

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