# mwand/eopl3

Code from the book "Essentials of Programming Languages", 3rd ed. by Friedman and Wand

Repository: https://github.com/mwand/eopl3
Canonical: https://ross.abutalabs.com/products/eopl3
Language: Scheme
License: NOASSERTION
License Family: other
Last push: 2023-03-13T13:53:58+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4776, "days_push": 1269, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1205, forks 280 (observed 2026-08-28T04:03:59.199274+00:00)

## What it is
The complete source code accompanying the textbook 'Essentials of Programming Languages', 3rd edition, by Friedman and Wand. It contains Scheme implementations of small interpreters and language processors for each chapter, runnable out of the box on Racket 6.11+.

## Use cases
- study interpreters from the EOPL book
- run the EOPL3 chapter languages in Racket
- follow along with a programming languages course
- experiment with implementing language interpreters in Scheme
- test all book languages with test-all.rkt

## When to choose
- you are reading or teaching from Essentials of Programming Languages 3rd ed.
- you want reference implementations of interpreters in Scheme/Racket

## When to avoid
- you need a production interpreter or compiler toolchain
- you want a modern testing setup or actively developed framework

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: interpreter, programming-language, parser, testing
- domain: programming-languages, compilers, education, tutorials
- platform: cross-platform
- tags: scheme, racket, textbook-code, interpreters, programming-languages-course

## Member repositories
- mwand/eopl3 (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:59.199274+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:19:36.464200+00:00, confidence not recorded.
  - readme: https://github.com/mwand/eopl3 (fetched 2026-08-28T04:03:59.199274+00:00, sha 3a7d4b98fe16)
- Data as of 2026-08-30T08:39:29.467469+00:00.