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Does'nt smalltalk have code=data behavior without s-expressions. I'm not an expert, but I thought that was the reason why Smalltalk has the IDE that everyone raves about along with image persistence

Or can Smalltalk be modelled as an s-exp based language?

http://en.wikipedia.org/wiki/Smalltalk#Image-based_persisten...

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I don't think Smalltalk has code=data. It has object-based metaprogramming, i.e. the code that you write turns into objects that you can write other code to manipulate at runtime. But perhaps that's a distinction without a difference? I don't have enough experience with Smalltalk to say.

I was expecting someone to suggest that stack-based languages are fundamentally different from tree-based ones.

Smalltalk would be trivial to model with s-exps: (object message args)

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