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Why this matters: In data engineering, Python environments often require heavy numerical and machine learning libraries that take minutes to download and install. BuildKit cache mounts persist these downloaded packages across builds, transforming sluggish container image creation into a cache-efficient process that significantly reduces CI/CD wait times. Consider a hypothetical pipeline that processes sensor data using a heavy stack of libraries: pandas , scikit-learn , numpy , and pya...

This is a submission for the Hacktoberfest Open-Source AI Challenge Week 3: Slow and Steady I never tidy my desktop or my folders so files pile up and sorting them by hand is tedious and always takes longer than I expect. So I made Dropzone Zero, a local agent which files each download the moment it arrives, by rules which I set once. Gemma 4 reads every file on my laptop, a little robot called Zee shows me what it is doing, and Undo last puts any file back exactly as it was. On 63 synthet...

We just hit 100 posts on DEV.to! 🎉 But milestones don't ship products. Users do. Welcome to Day 2 of Building HYNA-Stage . I’m Harun (12yo CEO), and my CTO Akhouri and I are on a mission: Get 100 active users for our ephemeral cloud staging CLI. Yesterday, we shipped GitHub Auth and squashed OAuth loops on a $150 Android phone. Today, we are tackling system design based on brutal, high-value feedback from the community. 🧠 The Trigger: A Senior Dev Caught a Flaw Yesterda...

Kinewright has a second engine: Wheels, how a body with exactly four wheels moves. Three stages are accepted, and this article shows what each one proved and every limitation still in place. What Wheels is Kinematics only: no tyres, no suspension, no physics. Every number here is traced from the engine's own run; nothing is measured. A shell with four wheels that pulls away, holds and changes speed, turns, brakes, stops, parks and manoeuvres in a b...

The QA report "When the sidebar is collapsed, the '+ Create' menu gets cut off." The screenshot showed exactly that: with the sidebar collapsed to 60px, the dropdown menu was sliced clean off at the sidebar's right border. Only the first character of "New folder" was visible. The strange part: with the sidebar expanded (244px), the same menu rendered fine. Same code, same 190px menu width. It only broke when collapsed. Where I got stuck My first suspect was z-index — ...

Sometimes a normal screenshot isn't enough. You need the whole page, top to bottom: for a bug report, a design review, or to save a landing page before someone changes it. Chrome can do this without installing anything. The option is just well hidden. Here are three ways to do it, from fully built-in to one click. Way 1: DevTools "Capture full size screenshot" This is built into Chrome and works on Windows, Mac and Linux. Open the page you want to capture. Open DevTools...

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Learn new skills for less. Discover how to apply a promo code for Udemy, find verified online discounts, and save on professional development.

ACH Return Codes Explained: A Developer's Guide to R01–R85 and Error Handling When a payout fails, the Nacha network doesn't just say "no." It sends back a specific return code—a two-character alphanumeric that tells you exactly why the transaction rejected. As a developer building payment systems, understanding these codes is the difference between a silent failure and a recoverable error. What Are ACH Return Codes? ACH return codes (R01 through R85) are standardized respon...

I hear this a lot, and it's one of the riskiest assumptions in cybersecurity. Ransomware can affect OneDrive, Google Drive and AWS S3. Not because Microsoft, Google or Amazon get "hacked," but because of how we use them. Here's how it usually plays out: 🔹 A laptop gets infected through a phishing email 🔹 Ransomware encrypts the files on it 🔹 The sync app sees the changes and uploads the encrypted versions 🔹 Every other device and shared folder gets the damaged files too Syncing wa...

Sooner or later someone files a ticket: "Add schema so we show up in ChatGPT." It sounds reasonable. Structured data is machine-readable, AI is a machine, so more markup must mean more AI visibility. It's not that simple. Here's what the documentation actually says, what's worth shipping on a SaaS site, and which claims to push back on. What Google says about schema and its AI features Google's guide to AI features (AI Overviews and AI Mode) is blunt: there's no special schem...

v0.9.2 gives an agent a portable form. rotifer genome export writes which genes an agent uses and how they are composed into one .rgenome file. rotifer genome import reads that file on another machine, rebuilds the agent from the Registry, and prints, for every gene, what it installed and why. v0.9.2 is the protocol version. It shipped in two npm releases of @rotifer/playground : 0.28.0 (export and import) and 0.29.0 (the file format fixed at format 1, stricter imports, and four change...

Disclosure: I'm affiliated with aquariumpet.co.uk, a UK shop that sells aquarium heaters. An aquarium heater's display tells you what the water is doing right now , near the rod. It doesn't tell you what happened at 3 a.m., whether the far end of the tank lags behind, or how long the heater actually runs each day. For that you need a log. This tutorial builds a small, independent temperature logger with a Raspberry Pi and a DS18B20 sensor. It writes a CSV and warns you when the temperature ...

Disclosure: I'm the maker of Ponte Sheets. Not tax advice; check your rate with an accountant. Freelance money arrives at random times, so "how much is in my account" is the wrong number. Here's the formula chain I use. The cell references are the real ones from my template: one tab per month (Jan..Dec), with Date in B, Type (Income/Expense) in C, Category in D, Net amount in J and Status (Paid/Pending) in K. Your tax rate goes in a Settings cell named TaxPct . Names like Profit , AfterTa...

I asked AI coding agents to write formally verified code. Every solution passed the verifier. Then I checked what the proofs actually promised. For the smaller model, 5 of 8 specifications barely said anything . One of the methods was wrong, and its proof was green. This post is about that gap, a cheap way to detect it, and a small open-source tool that does it for any Dafny file. The experiment I'm designing a programming language meant to be written by agents and che...

Freelancing for several clients at once means living in several codebases at once. That part is fine. The part that hurts is that every codebase was started at a different time, by a different person, with a different idea of what "current" meant. One client's Next.js app is happy on the latest Node LTS. Another is an older Express API that breaks in subtle ways on anything newer than the version it was built on. One project uses pnpm, one uses Yarn, one uses plain npm and has a package-lock...

A GPA calculator looks simple until courses have different credit values. Averaging the grade points directly gives every course the same influence, which is not the calculation we want for a credit-weighted GPA. This tutorial builds a small, framework-independent calculation function for a 4.0 scale. It accepts course credits and grade points, rejects incomplete inputs and keeps rounding separate from the calculation. Start with a worked example Consider these illustrative co...

Anything that runs while I am not watching needs two lists, and they are not the same list. The first is what it may touch. Directories, accounts, endpoints. Boring, and the only thing standing between a bug and a deleted folder. Mine is shorter than I expected: two working directories, one scratch directory, read-only everywhere else. Everything I have ever regretted came from a task that quietly needed one more permission and I gave it without thinking. The second list is what it may do ...

Healthcare AI systems frequently operate with incomplete instructions, ambiguous records, and conflicting information. A robust system should not assume that every request is sufficiently specified for execution. Developers can implement clarification mechanisms that identify missing parameters, detect conflicting values, and assess whether uncertainty materially affects the intended action. The response should be risk-sensitive. Minor ambiguity may be handled through a clearly stated assu...

"Jane Doe" on its own is a word in a box. Is she the instructor, a student, a guest? In a properly built table, VoiceOver says Instructor Jane Doe, column 2 of 3 - the header is what turns the word into a fact. Lose that relationship in the code and the table is just a grid of words, no matter how clear it looks on screen. This breakdown uses the Table Headers lab (E09): Case 1 ( <th> without scope ) and Case 2 ( scope="row" on column headers). Both use real header cells an...

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YouTube appears to be testing hiding the dislike button on videos, as reported by 9to5Google. At least two users on X have recently shared screenshots of the dislike button now being placed in the three-dots submenu, and a user on Reddit also shared an image of the dislike button being absent for them. Right now, […]

Short answer: keep vote ingestion separate from interval publication, assign every published tally a monotonic revision, and let a reconnecting viewer request the newest snapshot after the last revision it applied. For a live media poll, the least complex dependable design is one authoritative aggregator per poll, a durable vote log or database behind it, and disposable realtime connections in front of it. The five-second ticker is presentation cadence, not correctness. The page that should f...

PHP maintainers have announced upcoming security updates for two high-severity vulnerabilities, CVE-2026-109618 and CVE-2026-109619, both rated 9.2 in severity. Research suggests these flaws may impact PHP versions dating back to 2004. Reports have identified a tool, 'PHP2Shell,' purportedly capable of executing code on widely used platforms including Laravel, Drupal, and Joomla. Developers and sysadmins should prepare for an immediate update rollout. Because PHP is used to power ...