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Lisp Koans

github.com Books & learning Tutorials & guides Software engineering Candidate
Screenshot of github.com captured 2026-07-20
Page preview · captured 2026-07-20

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

Top comments

If you've seen the Lisp Koans in the past, you might want to revisit them someday. Around half a year ago I've rewritten[0] the original set of koans, fixed multiple correctness issues, added some content, and cleaned up the test framework; they now look much better than the original version. [0] https://github.com/google/lisp-koans/pull/111

Currently working through these to learn Common Lisp after being introduced to the language as part of a college CS class, can definitely recommend them along with Practical Common Lisp [0] and Let Over Lambda [1]. 0: http://www.gigamonkeys.com/book/ 1: https://letoverlambda.com/

This is mildly interesting coming out of google because I thought lisp wasn't a google-approved language. (Yes, there are other projects on github in non-approved languages, but they appear mostly to allow 3rd party interop with google services. The educational nature of this project puts it in a slightly different category.)

IvyMike·125-point thread·

I'm surprised to see that this is on Google's Github page. Do they have any projects (besides this) that use Common Lisp?

ihuman·100-point thread·

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

HN stats

Breakout years
4

100+ points or 50+ comments

Total points
535

reference only — not used in Hall rules or ranking

Total comments
118

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2013-06-01Lisp Koans by GoogleFirst breakoutjuanfatas12530
2013-09-18Common Lisp Koansmomo-reina10
2015-12-18Common Lisp Koansgalois19810022
2019-03-05Common Lisp Koansbibyte15133
2020-11-28Lisp KoansBest thread · Latest 20+ point returnphoe-krk15633
2022-03-05Lisp Koansgraderjs10
2024-06-11Common Lisp Koans (2022)nequo10