Ah, okay. Somehow in my mind I had reversed the meaning of "==" and "=".

@Joh-Tob: I am writing a text-adventure game, using a balanced binary
tree as the primary data structure for managing game data. I wrote my
own AA Tree implementation (with guidance from Wikipedia). I see the idx
and balance functions in PicoLisp reference, but my concern is I don't
see how you do with those an (efficient) self-balance after single
inserts to an existing tree, nor how to do self-balancing deletes from
an existing tree.

On 04/01/2017 01:46 AM, Alexander Burger wrote:
> Hi Christopher,
>> : (aa-search '(("threshold" (("long-description" "You stand in front of
>> a wooden door, reputed to be the home of one Dr. Theobold. The door has
>> a small keyhole.") NIL NIL 1)) NIL NIL 1) "threshold")
>> -> ("threshold" ...
>> However, if I run this command, I get a different result:
>> : (aa-search (rooms) "threshold")
>> ...
> The problem is the '==' in
>>       (if (== Key (car (aa-kv Tree)))
> You pass a transient symbol "threshold", and '==' checks for exactly this
> symbol. The scope of transient symbols is per file or REPL instance, so you 
> ran
> the first test probably in the same instance, while "threshold" in the second
> was a new, different, symbol.
> Either use '=' for comparison, or use only internal symbols as keys.
> ♪♫ Alex

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