One name == one meaning
Written by Grigory Rechistov in Uncategorized on 27.08.2026. Tags: functional programming, value, single source of truth,
This is a draft I started to write two years ago but never finished. I want to put it out anyway.
Category: Uncategorized
Primitive obsession in API design
Written by Grigory Rechistov in Uncategorized on 27.08.2026. Tags: design,
Recently I encountered a real danger in form of the primitive obsession code smell: https://luzkan.github.io/smells/primitive-obsession.
Using int as function’s return created a confusion about how many many return
values the function may return, and whether or not they could be interpreted as
boolean value …
Documented undefined and implementation-defined behavior in Python
Written by Grigory Rechistov in Uncategorized on 27.08.2026. Tags: undefined behavior, implementation-defined python,
This is an older inquiry into whether Python as programming language allows undefined behavior (UD) in the same sense that it has in C and C++. That is, UD is cases of erroneous program behavior that is outside of the scope of the language facilities, which may be assumed by …
What I look for in a job
Written by Grigory Rechistov in Uncategorized on 27.08.2026. Tags: career, job,
Written some time in 2023-2024. Finalized in 2026, when I was about to change the job.
Semi-structured thoughts about what a new position should have for me to be worth trying.
Money
- enough to compensate for inflation
- mostly cash, as little stock as possible
- ability to balance time and money …
My public projects portfolio
Written by Grigory Rechistov in Uncategorized on 04.05.2026. Tags: portfolio, github,
A few projects that I completed as part of my academic work, in my spare time or as a part of job interview processes.
Ретроспектива ПВД 1/2 мая 2026
Written by Grigory Rechistov in Uncategorized on 02.05.2026. Tags: hiking, pvd,
Погода и дорога: практически идеальные, скорее “слишком сухо”. +15° вечером, +12° ночью, +20° днём. Солнце всё время, ветер до 10 м/c.
Маршрут: 11 км вперёд, 11 км назад. Из них в каждый день 9 км по грунтовым дорогам, около 1 км по тропам, около 1 км по асфальту.
Стоянка …
Чеклист для майских походов выходного дня (ПВД) в районе Стокгольма
Written by Grigory Rechistov in Uncategorized on 27.04.2026. Tags: hiking, pvd,
Upd 2025-05-03.
Написано на основе предыдущих списков https://atakua.org/w/checklist-example.html и https://atakua.org/old-wp/wp-content/uploads/2014/06/triplist.pdf, адаптировано для ПВД в условиях Стокгольма в мае.
Общие замечания
Ожидаемая погода в районе похода: перепад температур от +5 до +25°C, возможны палящее солнце, дождь …
When would I approve a large pull request made by a magic genie?
Written by Grigory Rechistov in Uncategorized on 31.03.2026. Tags: testing, mutation testing, llm,
Preword
Recently I was asked to review a …
A case against default values for function arguments
Written by Grigory Rechistov in Uncategorized on 17.12.2025. Tags: api, clean code, design,
There is a good rule of designing functions (and class methods, which are a variant of functions): a function should do one thing only, and do it well.
A corollary of it is another tactical design rule: a function should have as few arguments as possible. Three is the absolute …
Pitfalls of measuring software performance
Written by Grigory Rechistov in Uncategorized on 02.12.2025. Tags: statistics, performance, measurement, experiment,
For every measurement, there is at most one (i.e., sometimes there are zero) way to carry it out correctly, and innumerable ways to do it wrong.
I want to share a few pitfalls that I fell into (and probably will do it again in the future) while working on …
Unit tests as finite state machine approximation of software
Written by Grigory Rechistov in Uncategorized on 16.11.2025. Tags: unit-tests, fsm,
Finite state machine (FSM) is both a strict theoretical concept and a practically useful mechanism to build and reason about certain kinds of software. Unit tests is a category of tests that focuses on having the minimum of dependencies when making verifiable assertions about production software’s behavior. Neither is …
Ultimate Open-Closed Code Evolution Cycle
Written by Grigory Rechistov in Uncategorized on 23.10.2025. Tags: solid, ocp, oop, interpreter,
Open-Closed Principle (OCP) is one of the SOLID principles. Code should be open to extension …
Expressing GoF Patterns using First-Class Functions
Written by Grigory Rechistov in Uncategorized on 13.10.2025. Tags: oop, fp, patterns,
Let’s see if I can express those patterns found in the GoF book, meant for object-oriented languages …
Wishlist 2025
Written by Grigory Rechistov in Uncategorized on 28.06.2025. Tags: wishlist,
Publicerad i augusti 2026 :-/
Kläder
Skaljacka av Gore i storlek XL.
Verktyg
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Liten Knipex tång
-
Knipex tångnyckel 250 mm
https://www.clasohlson.com/se/Knipex-tangnyckel-250-mm/p/41-1789
https://www.amazon.se/T%C3%A5ngnyckel-skruvnyckel-flerkomponents%C3%B6verdrag-250-86/dp/B01H73UPXE
How to test the tests
Written by Grigory Rechistov in Uncategorized on 16.02.2025. Tags: tests, tdd, metatests,
“What/who tests the tests?” This question arises at some point while learning Test-Driven Development (TDD). If every piece of production code ends up tested in the TDD process by construction, does the same apply to the code of the produced tests themselves?
It’s time to go meta.
Four outcomes of a test
Written by Grigory Rechistov in Uncategorized on 25.11.2024. Tags: tests, tdd,
Before we talk about how a test case could end, let’s recall its canonical structure. It is needed because we will refer to events that can happen in test’s …
Constructing Multiple-Choice Items
Written by Grigory Rechistov in Uncategorized on 22.11.2024. Tags: quiz,
The following is quoted from Wilbert McKeachie, McKeachie’s Teaching Tips, an older edition from the 1990-s.
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Teachers’ manuals that are provided for many textbooks contain multiple-choice items. You will not be able to rely on a manual as the source of all your questions, because it often will not …
When to not prepare an automated test?
Written by Grigory Rechistov in Uncategorized on 19.11.2024. Tags: tests, tdd, limits,
Wishlist 2024
Written by Grigory Rechistov in Uncategorized on 13.11.2024. Tags: wishlist,
Verktyg
- Verktygstavla
https://www.byggmax.se/verktygstavla-tellbe-p705228#1250=89042
- Knipex tångnyckel 250 mm
https://www.clasohlson.com/se/Knipex-tangnyckel-250-mm/p/41-1789
https://www.amazon.se/T%C3%A5ngnyckel-skruvnyckel-flerkomponents%C3%B6verdrag-250-86/dp/B01H73UPXE
- T-handle hex key set
Restaurering av Magura gaffel, avslutning
Written by Grigory Rechistov in Uncategorized on 01.10.2024. Tags: magura, gaffel, restaurering,
Början: del 1.
Forumtråden: https://happyride.se/forum/threads/restaureringsprojekt-magura-durin-md100-race.3702162/.
Luftkolven
Hade lite tid att ta isär luftkammaren och ta en bild. Elastomererna är helt tillplattade och smulas:
Om man jämför mot en bild funnen i service-PDF:en ser man skillnaden på nya brickor:
De nya verkar vara …
Restaurering av Magura gaffel
Written by Grigory Rechistov in Uncategorized on 31.08.2024. Tags: magura, gaffel, restaurering,
Forumtråden: https://happyride.se/forum/threads/restaureringsprojekt-magura-durin-md100-race.3702162/.
Om gaffeln
Jag har fått den Magura Durin MD100 Race som en del av en barncykel.
- Avsedd för 26-tumshjul med 9mm QR axel.
- Rakt 1⅛” styrrör.
- 100 mm slaglängd.
- Justerbar luftfjäder.
- Fäste för skivbroms.
- Justerbar rebound och remote compression lockout knapp.
- Vikt …
A hypothesis cannot be experimentally proven
Written by Grigory Rechistov in Uncategorized on 07.04.2024. Tags: hypothesis, testing,
TL;DR: there is a difference between “is proven” and “could not be disproven”.
Let’s say you have a hypothesis A. How do you test it? By doing a set of experiments E₁, E₂, E₃, etc., observing their outcomes and comparing them against predictions made by A.
How do …
Do you write your tests after the fact?
Written by Grigory Rechistov in Uncategorized on 25.02.2024. Tags: tdd, tests,
Do you write your tests after corresponding production code has been written? Do you run your new test, see it pass, consider the job done and then move on onto the next task?
Here is a thought experiment for you. I hope it will illustrate a problem with this approach …
#include directive implements inheritance
Written by Grigory Rechistov in Uncategorized on 18.02.2024. Tags: oop, lsp, isp, solid,
I came to realisation that certain design principles originally formulated within object-oriented programming (OOP) are applicable to a wider range of programming concepts. Inheritance is one of them.
Thoughts on bureaucracy
Written by Grigory Rechistov in Uncategorized on 05.02.2024. Tags: thoughts,
Bureaucracy has good (wut?) and bad sides.
The good intentions behind of formalizing an activity into a documented process is to reduce variation, reduce possibility for corruption and thus improve scaling. While all good things, there is a price to consider.
Automation has lower flexibility than humans have when it …