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Feeling cranky today, lockdown and everything. This is an elementary interpreter, clumsily implemented because of all the object oriented cruft.

Indeed... in Haskell this can be implemented with a GADT and an evaluator which is really easy to express.

Still useful to know the "pattern" regardless of OOP cruft, Javascript prototypes, or Haskell data types.

Don't you mean the Interpreter pattern /s