News from Habr

Array of weak in Swift

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Leschev @ Habr 2 place · 04/01/2023 05:21 EDT

In Swift, when working with objects, it’s important to manage memory correctly. One way to do this is by using weak references to avoid retaining objects too long and causing memory leaks. In this article, we will discuss how to create an array of weak references in Swift using a generic wrapper. Read more Read more ›

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GNU radio 802.11 black box optimization

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VasyaPal @ Habr 3 place · 03/31/2023 15:10 EDT

In this post I'll share my experience in adjustment of WiFi physical channel. The channel was implemented on a software defined radio (SDR) platform. WiFi looks like a very complicated thing standardized over hundreds of pages. Could a non-expert with a PC and a couple of 100$ devices (HackRFs) somehow improve it? Here I try to develop a WiFi optimization approach basically agnostic of protocol implementation details. There's some math... Read more ›

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Not 'Doom' ported

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quaer @ Habr 1 place · 03/23/2023 15:58 EDT

Cruel time. Nothing I can do.I needed positive emotions. Distract myself, do some useless work.Coding a game might help. Read more Read more ›

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About «free» #iam, #oidc, #saml, #etc

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korkin25 @ Habr 1 place · 03/22/2023 14:28 EDT

Reasons to write article: at the moment investigation is in a progress. Some of collected&tested info will be usefull for other. May be someone will add some tips. thank you.There is a task to develop a solution that allows: - keep users/groups in the some one directory - based on this information: 1. Access control to web applications via #oidc /#saml 2. Access control to vanilla #kubernetes. 3. SSH-access control... Read more ›

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The Collatz conjecture is the coolest mathematical trick of all time

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AKlimenkov @ Habr 1 place · 03/21/2023 11:13 EDT

On the Internet and in non-fiction literature you can often find various mathematical tricks. The Collatz conjecture leaves all such tricks behind. At first glance, it may seem like some kind of a trick with a catch. However, there is no catch. You think of a number and repeat one of two arithmetic operations for it several times. Surprisingly, the result of these actions will always be the same. Or,... Read more ›

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Вывод формулы для двустороннего определения дальности между UWB трансиверами

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aabzel @ Habr 2 place · 03/20/2023 12:23 EDT

Настал третий за 12 лет случай, когда в профессии программист-микроконтроллеров понадобилось вспомнить школьную математику. В этом тексте я представил перевод AppNote(а) "The mathematics of two-way ranging". Также добавил свои комментарии в те места, которые неочевидны при первом прочтении.Тема нужна для определения расстояния между двумя радио трансиверами, которые могут определять моменты времени прихода и отправки радиоволны. Такое умеют делать UWB трансиверы, например чип DW1000. Read more Read more ›

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Tutorial. Onchain Analysis basics

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pazlvbanke @ Habr 1 place · 03/17/2023 06:08 EDT

Last week, I introduced you to the world of onchain analysis and explored some of the ways it can be used to gain insights into the cryptocurrency market.Today, we're taking things up a notch with a tutorial that will guide you through running your own onchain analysis. By the end of this tutorial, you'll have the skills and knowledge you need to start analyzing blockchain data and making informed decisions... Read more ›

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Cross-Platform System Programming Guide for UNIX & Windows: Level 1

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simonzolin @ Habr 2 place · 03/17/2023 02:21 EDT

In this tutorial we'll learn how to write cross-platform code in C using the system functions on popular OS (Windows, Linux/Android, macOS & FreeBSD): file management functions and file I/O, console I/O, pipes (unnamed), execution of the new processes. We're going to write our own small helper functions on top of low-level userspace system API and use them so that our main code can run on any OS without modifications.... Read more ›

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Journey to find a headset with a good side talk cancellation mic for calls in an open office

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Murz @ Habr 3 place · 03/17/2023 02:04 EDT

TL;DR: All AI-based noise cancellations suck, only the physical cancellation technique works! And physical cancellation is implemented well only in Jabra devices yet, but other features suck them! All Bluetooth headsets suck too! So, no solution yet, just complaints!The environment: I work in a pretty talky office room, where sit around 10 people, and all of them have many online conferences every day, including me. So, silence in the room... Read more ›

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Обновляю ссылку один месяц, или Лёгких задач не бывает

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AllDmeat @ Habr 1 place · 03/15/2023 10:12 EDT

История о том, почему «обновить ссылку» — задача для техлида: тут и про тесты, и про вёрстку, и про архитектуры процессоров. Бульварное чтиво из 15+1 мемов Read more ›

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[Translation] PostgreSQL 16: Part 4 or CommitFest 2023-01

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kaze_no_saga @ Habr 1 place · 03/10/2023 08:27 EDT

We continue to follow the news of the PostgreSQL 16 release, and today, the results of the fourth CommitFest are on the table. Let's have a look.If you missed the previous CommitFests, check out our reviews for 2022-07, 2022-09 and 2022-11. Read more → Read more ›

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Onchain Analysis in Simple Terms

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pazlvbanke @ Habr 2 place · 03/09/2023 08:48 EDT

Hey there, my fellow crypto enthusiast! Are you looking to take your trading game to the next level and gain a deeper understanding of the market trends and behavior? If so, then onchain analytics is the perfect tool for you. Read more Read more ›

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[Translation - recovery mode ] What is IT? Where are they trying to throw? Pick direction/profession and your first programming language

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mastervlados @ Habr 1 place · 03/06/2023 07:56 EDT

Hope you know it. That Industry exists in our world. Where people-professionals are working, not robots. In fact the average competition for one workplace in IT is about 500 people – the market lacks specialists! This fact is confirmed and is easily found on the Internet.So, my opinion is we need specialists who know their business! For this reason, I wrote about how to become one and what you should... Read more ›

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[recovery mode] Autofill input fields in Android WebView

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chugunovr @ Habr 2 place · 03/05/2023 13:44 EDT

In this article, we will learn about autofill methods for input fields/forms in WebView used inside of an android app. I’d like to stress that the main topic is the autofill in WebView, because, when filling standard EditText views in the app - no issues arise. But when we display content owned by other parties, we can’t fill the form with our data in a simple way. Read more Read more ›

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Microfrontend. Server fragments — frontend as it supposed to be

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EgorVoronov @ Habr 3 place · 03/05/2023 13:42 EDT

Microfrontend is it supposed to be: Single Page Application, Server-side rendering and Independent deployments.Example that proves it's possible using React 18 + Suspense on server and Webpack Module Federation Read more Read more ›

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Writing The Matrix in Python: easy guide

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AKlimenkov @ Habr 1 place · 03/04/2023 11:33 EDT

Programming textbooks usually do not indulge us with variety of examples. In most manuals, the exercises are similar to each other and not particularly interesting: create another address book, draw a circle using turtle, develop a website for a store selling some kind of "necessary" advertising nonsense. Too far from the authentic imitation of "The Matrix". Although…How about taking over the control and starting to invent exercises yourself?Would you like... Read more ›

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DSL (domain-specific language) implementation with macros

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rsashka @ Habr 2 place · 03/04/2023 06:42 EDT

This is a translation of my own articleThe release of NewLang language with a brand new "feature" is coming, a remodeled version of the preprocessor that allows you to extend the language syntax to create different DSL dialects using macros.What is it about?DSL (Subject Oriented Language) is a programming language specialized for a specific application area. It is believed that the use of DSL significantly increases the level of abstractness... Read more ›

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Use of Python to write plugins for GIMP

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AmiraB2 @ Habr 3 place · 03/04/2023 06:38 EDT

GIMP (GNU Image Manipulation Program) is a free and open-source image editing software that provides users with a wide range of tools for editing and manipulating digital images. Python is a high-level programming language that is often used for scripting and automation tasks. The combination of GIMP and Python provides a powerful platform for users to create custom image editing plugins that can automate repetitive tasks, extend the functionality of... Read more ›

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Идеальная формула в одной команде тестирования или как мы пришли к ежедневной релизной схеме

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gevoro @ Habr 1 place · 03/03/2023 06:23 EDT

Привет! Меня зовут Евгения Воропаева. Я занимаюсь тестированием в PIMS-команде СберМаркета, мы разрабатываем внутреннюю систему для отдела контента и производства. Проект существует уже 2,5 года и за это время PIMS рос и развивался, приходили и уходили люди, менялись подходы к работе, внедрялись новые практики. Методом проб и ошибок мы выстроили процессы в команде тестирования, которые считаем оптимальными. Хочу поделиться результатом, к которому мы пришли и надеюсь, наш опыт будет вам... Read more ›

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Will transport planners lose their jobs as AI becomes smarter?

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Badianov @ Habr 1 place · 02/28/2023 18:14 EDT

As a Product Manager who has worked on the development of delivery route optimisation software for 10+ years, I see that modern technologies can significantly improve the optimisation process and deliver better solutions. AI, machine learning, and other modern technologies have the potential to revolutionise the way delivery routes are optimised in the future.With the increasing availability of data and the advancement of AI and machine learning algorithms, it is... Read more ›

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