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Lecture 7A: Metacircular Evaluator, Part 1

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Further reading 1

When does input become an instruction? →A typo can still be valid code. A data format can turn out to express computation. Follow an input inward and identify who decides how to interpret it.This video helps answer · What gives a string of symbols its meaning?

Caption notes

The metacircular evaluator needs an environment to interpret a variable. A procedure captures its defining environment so its free variables can be resolved when called.

Video or transcript source ↗
Original passages · 2
the environment is a dictionary which maps the symbol names to their values.
Lecture 7A: Metacircular Evaluator, Part 1 · ▶ 8:46–8:54
we have to capture that environment
Lecture 7A: Metacircular Evaluator, Part 1 · ▶ 13:35–13:38

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