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ProgrammingDEV Community ·

Python Decorators Explained: How Functions Wrap Other Functions

A beginner-focused guide breaks down Python decorators, a feature often seen as confusing at first. It shows how repeated logging code across functions can be replaced by a decorator that wraps each function. The article explains that the @ symbol is shorthand for passing a function into a decorator and reassigning the result. It also covers how *args and **kwargs let a decorator work with any function, and lists common uses such as logging, timing, caching, authentication, and retry logic.

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ProgrammingDEV Community ·

Scanner Probed a Site for 400 Secret Files in One Minute; None Were Exposed

A single client sent about 1,180 requests to a domain in one minute, requesting roughly 400 sensitive file paths such as environment files, WordPress configs, and cloud credentials. The client identified itself as tlm-scanner/2.0, and the site returned no sensitive files, with only the home page and redirects or refusals for the rest. Shortly afterward, a slower sweep disguised with browser user agents targeted a subdomain and included a path tied to AI provider keys. The author argues that such scans are routine and that site owners should check their own logs, since successful probes often go unnoticed.

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ProgrammingDEV Community ·

AI Student Launches Personal Developer Portfolio Showcasing Projects and Interests

A student studying AI and Data Science has launched a personal developer portfolio to consolidate their work in one place. Rather than just listing languages and frameworks, the site is meant to reflect their learning journey and the projects they are building. The creator also used the project as a way to experiment with presenting technical work through a polished web experience. Their next focus is Generative AI, LLM-powered applications, and AI agents, with plans to turn ideas into practical projects. They have invited other developers working on AI engineering to connect and share their work.

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ProgrammingDEV Community ·

New proof settles A(4)=4 for a 2-group problem via a single-vector argument

A researcher's open notebook on Kakeya-type problems reports a result on finite 2-groups whose involutions are all central. The author applies a closer look at a single vector to sharpen a restriction lemma from an earlier post. The analysis establishes that the invariant A(4) equals 4, which settles the question for groups with a self-centralising normal subgroup of the form Z_4^a x Z_2^b. The argument relies on anisotropic linear systems and a polar form, and it also establishes M(4)=4. The author notes that part of the verification was computer-assisted and that the associated tests passed before publication.

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ProgrammingDEV Community ·

Building Resilient TypeScript REST APIs with Node.js and PostgreSQL

A DEV Community post argues that backend slowdowns usually stem from inefficient queries, missing connection pooling, and weak TypeScript typing rather than hardware limits. It recommends moving beyond basic CRUD toward a production-grade architecture. The author highlights strict type safety, using TypeScript interfaces for request validation and database models to catch errors at compile time. The piece also advises analyzing query execution with EXPLAIN ANALYZE instead of adding indexes blindly. It closes by asking developers which stubborn bottleneck they have recently debugged in a Node.js REST API.

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ProgrammingDEV Community ·

Next.js useSearchParams() Build Error: Why It Needs a Suspense Boundary

A developer adding a search box to a navbar hit a build failure in Next.js even though the code ran fine in development mode. The error arises because static pre-rendering cannot access the query string, so Next.js requires a Suspense boundary to limit client-side rendering to the affected component. Placing the component in a shared layout means one unguarded hook can break the build for every static route, which explains why the error names a page the developer never edited. Wrapping the search box in a Suspense boundary within the layout keeps the other pages static while only that component renders in the browser. For single-page needs, reading the searchParams prop directly is an alternative, though it makes that route dynamic.

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ProgrammingDEV Community ·

Keeping a Daily Log for Your Google Play Closed Test

Developers often discover their closed test has failed only late in the process, when tester numbers have dropped below the required minimum. A simple daily tracker can flag problems early, giving time to recruit replacements before the 14-day window closes. Recommended columns include opted-in and active testers, joins and drops, build version, and feedback with fixes shipped. Setting a red warning when opted-in testers fall below 14 provides a buffer for calm recruitment. A real campaign example showed 18 testers joining, 11 finishing all 14 days, and Google granting production access afterward.

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ProgrammingDEV Community ·

moshcode 0.117.0 adds parallel AI agent work queues gated by verify commands

The moshcode 0.117.0 release introduces a 'work' command that runs many AI coding agents against tasks, where a task counts as done only when its verify command exits with code 0. Each worker runs headless in its own git worktree, and failed attempts are requeued with the verifier output or moved to an inbox after three tries. The author used 50 Claude workers to fix 139 locally failing tests, finding that 138 were PWA tests crashing on missing dependencies and one was a real failure caused by a test inheriting the host's PATH and HOME. All 19 resulting tasks passed on the first attempt, reducing local failures from 139 to zero. The author plans to extend the verifier beyond tests to typechecks, URL checks, and eventually Lean proofs.

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ProgrammingDEV Community ·

REA: An Open-Source Tool Lets Coding Agents Trace How Finished Apps Work

REA, short for Reverse Engineer Anything, is an MIT-licensed open-source MCP server that links coding agents such as Claude Code, Codex, Cursor and Gemini CLI to reverse-engineering tools. Users point the agent at a finished app and ask about a specific feature, after which it traces the underlying code. Documented targets include native binaries, JavaScript and Electron apps, .NET assemblies, Android APKs and websites, with each finding accompanied by its evidence and limitations. Setup is run through npm, and the project's documentation restricts use to lawful research, interoperability, software preservation and authorized examination. The project warns users to install only from official sources to avoid look-alike repositories.

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ProgrammingDEV Community ·

Launch checklist: making a new product findable on Google and AI assistants

Once early friends have signed up, new users typically discover a product through Google and AI assistants, so findability needs deliberate technical work. The author, from the Serpair team, recommends checking whether a product's name ranks in search, verifying the site in Search Console, and testing how AI tools describe it. Advice includes pairing the product name with its category in page titles and headings, keeping the name identical across platforms, and adding WebSite and Organization structured data with accurate sameAs links. The article stresses that schema alone does not reliably increase AI citations, so visible text should carry the key facts. It also explains that AI assistants can only cite pages their crawlers can access, and outlines robots.txt rules for OpenAI, Perplexity, and Googlebot, plus CDN and firewall checks.

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ProgrammingDEV Community ·

Controller drift or game deadzone? How to check raw stick values

A controller that drifts in one game but not another often reflects different software deadzones applied by each game rather than hardware failure. Competitive shooters with small deadzones expose stick looseness, while adventure games with larger defaults can hide it. To check, use a raw-value tester after pressing a button, since browsers only provide gamepad data after user interaction, and watch the resting stick reading. Values of 0.02 to 0.04 are normal noise, while persistent readings above about 0.08 are noticeable and above 0.15 are severe. A circle calibration test, where the stick is rotated two laps, can also reveal travel loss, with a roundness above 1.3 indicating a problem, and a dated screenshot of a high resting reading can support a warranty claim.

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ProgrammingDEV Community ·

Zero-shot models vs XGBoost and LightGBM: benchmark across three UCI datasets

A developer benchmarked two pretrained zero-shot models, Mitra v2 and TabPFN-3.5-Fast, against XGBoost and LightGBM on three public UCI datasets. The tasks covered binary classification of shopping sessions, regression of hourly bike rentals, and multiclass classification of bean varieties. All models used the same 60/20/20 train, validation, and test split with a fixed seed, and each foundation model was tested with raw and engineered features. The classical models were given only a small hyperparameter search, which the author acknowledges could be improved with broader tuning. Results are reported as primary metrics per dataset, with the foundation models scoring close to or above the tree-based baselines in several cases.

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ProgrammingHacker News ·

Wild boar and deer in the Netherlands adapt their behavior to the return of wolves

Wildlife cameras in the Netherlands have recorded wild boar and deer changing their habits in response to the presence of wolves. The footage suggests the animals are adjusting instinctively to the returning predator. The report is based on a video published by Dutch broadcaster NOS. Details beyond the observed behavioral changes are limited in the available source material.

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ProgrammingHacker News ·

Could MCP Become the Shared Base for Decentralised Smart Search?

A Hacker News discussion links to an article asking whether the Model Context Protocol (MCP) is emerging as a common foundation for smart, decentralised search. The piece examines how MCP might let AI tools connect to multiple data sources without relying on a single central index. The post has drawn 8 points and 2 comments on Hacker News so far. The source material provided is limited to the link and engagement metrics, so the article's specific arguments are not detailed here.

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ProgrammingDEV Community ·

Seven Sports Builds Amblyotube, a VR App for Vision Training Inspired by NASA Research

Seven Sports developed Amblyotube, a first-person virtual reality application for Meta Quest aimed at vision training. The team drew on insights from NASA's CRS-35 research mission when designing the app. The core engine applies different processing to each eye, using a blur shader for the dominant eye and an AI sharpener for the lazy eye before compositing the gaze. The resulting image is combined through a binocular fusion step to support joint eye use. The project's code is open source, and the developers invite contributions via a public GitHub repository.

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ProgrammingDEV Community ·

AgentMesh Uses FalkorDB Graph Memory to Help AI Agents Retain Project Context

A developer built AgentMesh during FalkorDB Graph Hacks 2026 as a persistent memory layer for AI agents. The project addresses the difficulty agents have retaining project decisions across separate sessions and handling changed requirements. Instead of storing knowledge as isolated text, AgentMesh models memories, sessions, and decisions as a connected graph so relationships are part of the stored data. Three specialized agents handle extraction, retrieval, and contradiction review, allowing a newer decision that conflicts with an earlier one to be flagged. The developer presents the graph-based approach as a way to retrieve prior context without requiring users to restate earlier decisions.

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ProgrammingDEV Community ·

Why a short handoff brief before a coding agent starts prevents wasted review

Agent runs often go wrong not because of the code but because the task's intent never fully reached the prompt. Writing a brief that states the goal, scope, off-limits areas, checks, and completion criteria turns review into a simple comparison against what was asked. Ambiguities should be listed in advance under an escalate section so the agent surfaces them as questions rather than guessing silently. Durable project rules belong in the instruction file the tool already reads, leaving the brief focused on the single task. The author illustrates this with a deprecated client-method migration, where a precise brief answers the questions a vague one leaves open. Reviewers should check the diff against the brief's scope and rerun the checks themselves rather than trusting a summary.

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ProgrammingDEV Community ·

Uniface Reporting Service Adds Year Comparisons, Cash Forecasts and Sales Funnel Using Plain SQL

A customer app built in Uniface 10 gained a reporting service covering a cockpit, month-end report, year comparison, margins, cash forecast, stock turnover, service figures and a sales funnel. All of it runs in a single service, KPI2_SVC, which builds plain SQL, queries SQLite and returns Uniface lists or writes HTML files. The cockpit returns eighteen figures bundled as key-value items rather than separate output parameters. The author deliberately avoided window functions, CTEs and multiple scalar subqueries, after an earlier SELECT without a FROM clause silently terminated the Uniface process. Year-over-year comparisons instead use derived tables with twelve literal month rows, so months without revenue still appear. The approach was tested with Rocket Uniface 10.4.03 and SQLite 3.50.2 in October 2026.

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ProgrammingDEV Community ·

How 60 GHz mmWave Radar Detects Breathing and Presence Without Contact

Millimeter wave radar can sense human presence, breathing, heart rate, movement, and sleep stages without cameras or wearables. It works by transmitting a continuous 60 GHz frequency-modulated signal and analyzing the reflected echoes for range, velocity, and phase changes. The 60 GHz band's roughly 5 mm wavelength lets it detect chest movements smaller than one millimeter caused by breathing. The technology is positioned as a practical option for homes, elderly care, hotels, and offices, and is compared against PIR sensors, cameras, and wearable devices. Compared with the 24 GHz band, 60 GHz is better suited to breathing and sleep monitoring, while 24 GHz is more suitable for wide-area presence detection.

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ProgrammingDEV Community ·

Uniface app adds orphan-row checks to SQLite, which lacks enforced foreign keys

The customer app built in Uniface 10 uses a database of 95 tables that declares no foreign keys, so SQLite can store records like invoice lines whose parent invoice is gone. The article presents a Uniface service, DQ3_SVC, that detects these orphaned rows and also flags data that is valid in form but wrong for the business. Foreign key enforcement is disabled by default in SQLite and must be turned on per connection, while PRAGMA foreign_key_check only works on declared keys. The author's approach runs a NOT EXISTS query for each child-parent relation across 48 pairs and reports every result, including zeros, as evidence that the checks ran. The SQL is portable to any SQLite database and was tested on Rocket Uniface 10.4.03 with SQLite 3.50.2.

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