Subclassing hierarchy of Strings and Arrays

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FlameDuck

A 2 dimensional array is nothing more than an array of arrays, essentially.

However there is a difference between rectangular (2D) and jagged (Array of Arrays) arrays.

Maps and Trees are nothing more than lists of lists.

That's because in LISP (List Processing) everything is a list, as opposed to OO languages where everything is an object.

That's one really nice thing about lisp and this type of a classification hierarchy

This has nothing to do with "this kind of structure". It is because everything in Lisp is a list. Now oppowsed to what they thought back in 1958, a list is not the best solution for every problem.

Before you answer, think about this: How would you reverse a non-linaer datastructure (like a Graph)? I know you're a big fan of Lisp, but you are in a minority.