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Scientist: A Ruby library for carefully refactoring critical paths

github.com Software & code Software projects Software engineering Candidate
Screenshot of github.com captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
5
submitters
5
observed span
2017–2023
peak thread · 19 comments
178 pts
latest 20+ return · 2023-11-14
154 pts

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.

First comments on top threads

HN comment order

I've use Scientist for every major refactor I've done--IMO it's one of the best examples of a library that does one thing extremely well and has a clean interface.

We've used this extensively at my work and it has been great. As someone else pointed out it's a bit tricky if the code isn't idempotent. We used this as part of a data migration project and for writing we ran the experiment 100% of the time and read back the result to check it was correct - a bit of a performance impact but nothing that was noticeable. One super useful extension we've made to the gem is to…

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.

Breakout years
2

100+ points or 50+ comments

Total points
337

reference only — not used in Hall rules or ranking

Total comments
34

reference only — not used in Hall rules or ranking

Every submission