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I built a bilingual typing coach with a free 60-second test
Most typing sites start and stop with a WPM timer. You finish a minute, you get a number, and the session ends. That is measurement, not coaching. You leave without knowing which keys are actually slowing you down, and the next drill is often the same for everyone.I built Keytrainer for that gap. After a short test, it names one weak transition — the letter pair that is costing you time — and builds adaptive practice around it. The adaptive practice stays free. The point is practice that changes
Transitive dependencies explained: why a package you never installed can still break your build
You run a scan and get a HIGH severity finding in [email protected]. You grep your package.json — it isn't there. So why is it in your build? Direct vs transitiveA direct dependency is one you declared yourself, in package.json, requirements.txt, pom.xml, or whatever manifest your ecosystem uses. A transitive dependency is one of those packages' own dependencies — and their dependencies' dependencies, recursively, however deep the chain goes. A typical modern JavaScript project has a handful o
VIGÍA ML: Gas-Well Predictive Monitoring That Runs Entirely in the Browser (TensorFlow.js + React)
VIGÍA ML is a predictive console for gas wells — production forecasting, anomaly detection, fault diagnosis, and operational recommendations — where every model trains and runs live in the browser. No backend, no GPU cluster, no data leaving the device.Live demo (Spanish-first UI): https://alicelabs-llc.github.io/vigia-ml/Source: https://github.com/alicelabs-llc/vigia-ml The problem it targetsProduction engineers and field operators work with well time series — tubing pressure, flow rates,
How to Load the Omniston Widget with @ston-fi/omniston-widget-loader
Use the npm loader to fetch the current Omniston Widget bundle at runtime, connect TON Connect, and mount a complete swap interface inside your application.If you are building a modern JavaScript application, @ston-fi/omniston-widget-loader gives you programmatic control over when the Omniston Widget enters the page. You install a small npm package, call its load() method, receive the OmnistonWidget constructor, create an instance, and mount that instance into a DOM element.The important detail
Under the Hood: Building a Zero Latency Unicode Symbol Generator in the Browser
Hunting for special characters, decorative glyphs, or technical arrows during web development often leads to clunky character map tables or ad-laden websites. When building user interfaces, documentation, or social bios, developers and designers need instantaneous access to clean Unicode symbols without page reloads or intrusive popups.To solve this friction, we engineered the Symbol Generator at BetterUtils. The entire application is built on Next.js and Tailwind CSS, executing completely on th
Securing the Subscription Pipeline: Designing a Safer Intake Flow for Digital Subscriptions
Securing the Subscription Pipeline: Designing a Safer Intake Flow for Digital SubscriptionsMost subscription systems are built on a dangerous assumption: that the user submitting the request is always legitimate, operating in good faith, and connected via an ultra-reliable network. Last month, during a traffic spike following a major product launch, our team watched helplessly as an unvalidated subscription intake flow collapsed under a wave of malformed payloads and concurrent duplicate r
Frozendict 🧊: State of the Art Immutable Hashmap for Python and Node JS.
Hello 👋!So there I was, staring at Python's frozenset, feeling that specific special rage that only a data structure enthusiast at 1AM can feel, while dict sat there, utterly mutable, fully hashable, completely disobedient.Dictionary keys can change. You can pop from it. You can clear it. You can update it mid-computation and break 30 tests simultaneously.I looked at this situation calmly. And then I did what any reasonable person would do: I wrote frozndict, a fully immutable, insertion-ordered
What Your App's Text Input Bar Reveals About Your Engineering Culture
What Your App's Text Input Bar Reveals About Your Engineering CultureIf you want to know the true maturity of a software team, don't look at their microservice architecture or their Kubernetes setup. Look at their text input bar.I have spent years building edge-deployed autonomous systems and high-throughput real-time apps. Across dozens of codebases, one pattern holds true: the humble text input bar is the ultimate diagnostic tool for frontend and full-stack engineering quality. It sits r
A constitution is a behavior contract, not a description
AI Harness Engineering · Essay Two · derek wang (derekwang85)Before you tell an AI what to build, you have to tell it who it is, where its lines are, and how it's allowed to work. Get that wrong first, and no amount of clever prompting downstream will save you. This essay builds the top layer of the constraint pyramid: the strategy charter — the one file that decides whether your AI is doing the right thing at all. The one file that sets the coordinate systemA prompt tells the model a task.
The Four Ways Your Word Template Silently Breaks
If you've ever generated a Word document from a template — a proposal, acontract, a report — you've probably hit a moment where the output lookssubtly wrong and you can't figure out why. The numbering restarts partwaythrough a list that should be continuous. A heading's spacing just... isn'tapplied, even though you can see the setting in the XML. A stray blank pageshows up at the end of every document, no matter how many times someone"fixes" it in Word.None of these are bugs in Word, and none of
SDCC – Small Device C Compiler
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Science Is Open Software
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Choose Next.js Server Actions or Route Handlers by the contract with the caller
When writing a server-side mutation in Next.js, the same business logic can appear to fit inside either a Server Action or a Route Handler. Memorizing “Actions for forms, Routes for APIs” becomes less helpful when a mobile app or a cron job needs to invoke it too.The choice starts with the contract you want to give the caller. An Action is a candidate when the operation belongs to a Next.js screen, including its navigation flow. A Route Handler fits when you want to explain a URL, HTTP method, a
Architectural Breakdown: A logo at 1.00:1 contrast passed every check we had
# A Logo at 1.00:1 Contrast Passed Every Check We Had---## What Actually Broke in the DraftThe original implementation looked fine on paper. Paper doesn't hit production at 3 AM when your node is thrashing. Here's what the code actually did wrong:**Defect 1: The Decompression Lie.** `_decode_idat()` calls `zlib.decompress(da
Google Apps Script answers webhooks with a 302: why Stripe retries forever, and how to fix it
I run a small setup where a Stripe payment triggers Google Apps Script (GAS) to email the product to the buyer. While building it I hit the kind of trap where everything "works" and you still get an incident. Here is what went wrong, how I fixed it, and how I test GAS logic without opening the editor. Trap 1: a GAS web app answers POST with a 302When you deploy GAS as a web app (/exec) and receive a Stripe webhook in doPost(e), this happens:doPost does runbut the response is a 302 redirect
Four archives that keep short films and observations on the page
This issue carries four archives that turn short films and observations into pages you can read. What this issue carriesThese are small publications with their own subjects and formats. Each gives the words, images, or objects a place to stay after the original moment passes.Why Your Brain Does That Why Your Brain Does ThatWhy Your Brain Does That is an index of named experiences and the reasons behind them. It is for anyone trying to understand a familiar mental habit, and it gives yo
Building a Streaming Chatbot with Node.js
Most backend tutorials show synchronous calls: the API generates the full response and only then prints it, after several seconds of waiting. That’s not how real chat products work — in interfaces like ChatGPT or Claude, the response starts appearing word by word, before it’s even complete. That’s called streaming, and it’s what we’re going to build today.What you’ll learnRendering LLM responses token by token in the consoleUnderstanding the streaming architecture (real-time data events, similar
Scraping Meta's Ad Library Without a Browser: the 200 OK That Means Blocked
Meta publishes every ad running on Facebook and Instagram in its Ad Library, and offers an official API only for political ads, behind an identity review. So everyone else scrapes the page.Most of the tools that do it drive a whole headless browser, and you can see the cost of that decision from the outside: on Apify, every Actor in this niche that runs with 4 GB of memory sits at a couple of hundred monthly users, while the ones above a thousand run in 128 MB to 1 GB — two of the three biggest
🖱️ How I Fixed Canvas Click Coordinates in Limn Engine
🖱️ How I Fixed Canvas Click Coordinates in Limn EngineThe bug that made buttons unclickable on scaled canvases — and the patch that fixes it. 🎯 Try the FixPlay the demo with the patch installed:👉 limn-engine-doc.vercel.app/arcadeThe Limn Arcade runs every game through this patch. Click any game, tap any button — the coordinates land exactly where they should, even on phones, tablets, and scaled desktop windows.Grab the patch here:👉 github.com/terracodes004/limn-engine-doc 📖 Intro
12 Best Sites to Buy Verified Alipay Accounts (Aged & PVA ...
Buy Verified Alipay Accounts – Verification, Security & Responsible Use Guide🌟 CONTACT USA DIGITAL HUB 🌟💬🎧 Discord: usadigitalhub📱📞 WhatsApp: +1 (506) 541-7768✈️📲 Telegram: @usadigitalhub📧📩 Email: [email protected]🌐🔗 Website: https://usadigitalhub.com/⚡ Fast Response • 🛡️ Reliable Service • 🤝 Customer Support✨ USA Digital Hub — Your Trusted Digital Service PartnerMeta Description: Learn what verified Alipay accounts mean, how real-name verification works, why legitimate owners
