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ProgrammingDEV Community ·

Rails Has Quirky Ordinal Methods Up to .forty_two for Array Access

Ruby on Rails includes a set of unconventional helper methods that allow developers to access collection elements by ordinal position. These methods include .second, .third, .fourth, and .fifth, and unusually extend all the way to .forty_two. The inclusion of .forty_two is widely regarded as a nod to the number 42, famously referenced in Douglas Adams' 'The Hitchhiker's Guide to the Galaxy' as the answer to life, the universe, and everything. These convenience methods are part of Rails' ActiveSupport library and serve as readable shortcuts for index-based access. The quirky addition reflects the Rails community's tradition of blending practicality with developer humor.

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ProgrammingDEV Community ·

Developer Builds Ethereum-Like Blockchain From Scratch in C++17 With No External Libraries

Developer Martial Zinsou has released Nstrike version 0.1.0, an open-source MVP implementation of an Ethereum-style blockchain written entirely in modern C++17. The project was built from scratch without any external dependencies such as OpenSSL, Boost, or secp256k1, with all cryptographic primitives implemented manually. Nstrike includes a mini virtual machine, ERC-20 token support, Proof-of-Work consensus, a JSON-RPC 2.0 server, and a command-line wallet interface. The codebase passes a suite of 32 unit and integration tests covering SHA-256, Keccak-256, ECDSA, and 256-bit arithmetic. Published under the MIT licence, the project is compatible with macOS and Linux and is available on GitHub.

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ProgrammingDEV Community ·

ng-prism offers Angular-native Storybook alternative with compiler-driven docs

A developer has released ng-prism, an Angular-native component showcase tool designed as an alternative to Storybook for Angular component libraries. Unlike Storybook, ng-prism uses a single @Showcase decorator placed directly on the component, with the TypeScript Compiler API extracting metadata at build time rather than relying on separate story files or runtime reflection. The tool renders components directly into the document instead of an iframe, avoiding isolation issues with Angular CDK overlays and portal-based elements like MatDialog. Version 22.2 ships with three new features: a visual-regression panel, an Overview contact sheet, and a redesigned UI built around a density scalar. Setup requires one command that integrates ng-prism's builders into an existing angular.json, and a provided transformer strips the decorator from compiled output so end users of published libraries need not install ng-prism.

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ProgrammingDEV Community ·

How to Build a Production-Ready Polymarket Trading Bot in Rust

Developer Bo$onaX has published a detailed architectural guide for building a production-grade trading bot on Polymarket, the decentralized prediction market platform. The design separates six core layers — market discovery, data ingestion, strategy engine, risk controls, execution, and reconciliation — to handle asynchronous state changes reliably. A key principle is that a successful HTTP response should never be assumed to confirm correct trading state, so order and fill events feed back into state and risk systems via a dedicated reconciliation loop. The guide recommends using Rust, WebSocket streams for low-latency market data, and fixed-point arithmetic instead of floating-point for price and size calculations. Strategy decisions are expressed as structured OrderIntent objects, keeping strategy logic, risk validation, and order execution cleanly isolated from one another.

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ProgrammingDEV Community ·

Low correlation alone does not make a trading bot a good diversifier

A developer running a paper-trading fleet of crypto bots discovered that adding trend-following bots to decorrelate his portfolio did not improve overall performance. While the breakout bot achieved near-zero correlation (r ≈ 0.05) with his mean-reversion bots, it posted a loss of 445 units and carried a negative Sharpe ratio across backtests. Meanwhile, two bots he assumed were diversified turned out to correlate at 0.93, meaning he was effectively doubling down on the same bet across two exchanges. The key insight from two months of daily P&L data is that low correlation is a necessary but insufficient condition for diversification — a bot with negative expected returns only adds a separate stream of losses. The author concluded that decorrelation only benefits a portfolio when each strategy also carries a non-negative edge.

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ProgrammingDEV Community ·

Confirmed vs. Potential Vulnerabilities: Why the Distinction Drives Smarter Security Response

Security scanners classify vulnerabilities as either confirmed — verified through direct evidence — or potential, where a weakness is suspected but unproven, often due to backported patches that leave version numbers unchanged. The two categories demand different responses: confirmed findings require immediate remediation, while potential findings must first be investigated before action is taken. Mishandling potential vulnerabilities is a leading cause of vulnerability management failures, with teams either ignoring them and missing real risks or exhausting resources chasing unconfirmed alerts. The stakes are rising sharply, as over 30,000 new CVEs were recorded in 2025 and the median time-to-exploit has fallen to just five days. With nearly 29% of CISA's Known Exploited Vulnerabilities exploited on or before their CVE publication date, deferring investigation of potential findings is no longer a safe triage strategy.

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ProgrammingDEV Community ·

Blazor Blueprint crosses 600 GitHub stars nine months after open source launch

A developer released Blazor Blueprint as an open source UI component library in early 2025 after building it alongside a real commercial product, seeking a modern shadcn/ui-style look for Blazor that existing libraries did not offer. The project gained over 160 GitHub stars within its first week following a Reddit post, and has since grown to more than 600 stars. Version 4.1 of the library adds a Scheduler, Pivot Data Grid, new chart types, a Signature Pad, and Barcode and QR Code components, with a Spreadsheet component planned. The library is currently in production use across the author's company product, client projects, and internal tools, including an analytics platform and an ISO 27001 management tool. The developer reflected that watching an early fork of the project felt unsettling at first but came to view it as a normal part of participating in the open source community.

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ProgrammingDEV Community ·

How to Build an Interactive Excel Dashboard for Jumia E-commerce Data

A data analyst developed an end-to-end Excel dashboard to analyze product pricing, discounts, ratings, and customer reviews sourced from Jumia, a Kenyan e-commerce marketplace. The raw dataset contained 115 product entries across six columns, including current price, old price, discount percentage, review count, and star rating. Before analysis, the data required significant cleaning to address duplicate entries, missing values, inconsistent formatting, and incorrect data types across multiple columns. Techniques such as Find and Replace were used to remove unwanted text strings like 'out of 5' from the rating column and fix negative values in the reviews column. The cleaned and standardized dataset was then used to build an interactive dashboard summarizing key performance trends and correlations between pricing and customer engagement.

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ProgrammingDEV Community ·

Developer builds Junction app to auto-switch Mac browsers based on battery state

A developer created a free macOS utility called Junction after noticing his Zen browser drained battery significantly faster than Safari at coffee shops. The app sits in the menu bar and intercepts every system-wide link click, routing it to a user-specified browser based on customizable rules. Its key feature is power-state awareness, automatically switching to a battery-friendly browser when unplugged and reverting when the charger is connected, with no restart required. Users can also set host- or regex-based rules, such as always opening GitHub links in Chrome, with a keyboard-navigable picker for unmatched links. Junction is available for free, with an optional one-time supporter license for those who wish to contribute.

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ProgrammingDEV Community ·

How Three Unchecked Non-Figure Claims Exposed Gaps in a Code Review Checklist

A software development team discovered that a commit receipt contained three factually incorrect claims — about a carrier label, a sequence position, and a branch state — even though every numerical figure in it was accurate. The errors went undetected because the team's verification rule only required reading back figures and text, not every type of claim a receipt could make. The rule was subsequently broadened to require read-back verification of all claims, including coordinates, states, and counts, not just numeric values. A separate checklist item was also found to be ambiguous, as it failed to specify which file set a link-checking tool should scan, allowing a branch to pass locally while risking failures in the repository's shared cycle. These findings highlight that verbatim text verification against a source does not guarantee the accuracy of the claims that text makes.

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ProgrammingDEV Community ·

Switzerland Gets Internet Archive Mirror, Inspiring Parallel to VR Amblyopia Therapy

A new Swiss mirror of the Internet Archive, internetarchive.ch, launched this week to provide geographic redundancy and reduce the risk of a single point of failure taking the archive offline. A developer drew a parallel between this distributed-systems thinking and dichoptic VR therapy for amblyopia, a condition where one eye is weaker than the other. Traditional treatment relies on patching the dominant eye, which suffers from poor compliance and does not train both eyes to work together. A Meta Quest app called Amblyotube, built by Seven Sports, instead delivers YouTube-style video with separate visual processing for each eye simultaneously, embedding the therapy within content users choose to watch. The app uses AI-driven sharpening, adjustable blur, color cues, and flicker effects per eye, leveraging the Quest headset's ability to render independent images for each eye without specialised medical hardware.

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ProgrammingDEV Community ·

How SpringApplication.run() Bootstraps a Spring Boot App: A Technical Deep Dive

Every Spring Boot application starts when SpringApplication.run() is called from the main() method, triggering a multi-step startup sequence. Internally, the static run() method first creates a SpringApplication instance — where all configuration occurs — before invoking the instance-level run() for execution. During construction, Spring Boot deduces the web application type (SERVLET, REACTIVE, or NONE) by scanning the classpath for relevant classes. It also loads ApplicationContextInitializers and ApplicationListeners from META-INF/spring.factories, assigning each a distinct role in configuring the context or reacting to application events. For advanced use cases, developers can manually instantiate SpringApplication or use SpringApplicationBuilder to customize settings or build parent-child context hierarchies before startup.

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ProgrammingDEV Community ·

Developer builds comment section for GitHub profiles using Discussions and SVG

A developer has created a tool that adds a functional comment section to GitHub profile pages, a feature the platform has never natively offered. The system uses GitHub Discussions on a user's profile repository to store messages, which appear on the profile within about 30 seconds of posting. Because GitHub's profile README only supports SVG-based dynamic content, all user avatars must be pre-downloaded and embedded as data URIs at build time, with no external fetching allowed. The project requires no database or dedicated server, relying entirely on GitHub's own infrastructure. It is now available on the GitHub Marketplace, with source code published under the repository LISK819129/GitComment.

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ProgrammingDEV Community ·

Developer Guide: Building a Multi-Agent RAG Legal Assistant Using LangGraph and FastAPI

A new beginner-oriented tutorial published on DEV Community walks developers through building an AI-powered legal assistant tailored to UAE Federal Law documents. The system uses Retrieval-Augmented Generation (RAG) to answer questions based solely on uploaded legal PDFs rather than relying on a language model's training data, reducing the risk of hallucinated legal clauses. Unlike basic RAG setups, the architecture employs a cyclic multi-agent pipeline built with LangGraph, where a fact-checker node verifies each drafted answer against the source text before it reaches the user. The full stack includes FastAPI for the backend, Streamlit for the frontend, and Pinecone as the vector database for storing and retrieving document embeddings. Although the tutorial uses UAE labor law as its example dataset, the guide notes the same architecture can be adapted to medical guidelines, company policies, or any custom document collection.

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ProgrammingDEV Community ·

Beginner's Guide to HTML: Comments, Tags, and Your First Web Page

A Phase 1 HTML tutorial aimed at beginners introduces core concepts including how to set up VSCode with a live server extension. The guide explains HTML comments — notes written in code that browsers read but do not display on the rendered page. It warns developers that comments remain visible in the page source, making it unsafe to store passwords or API keys within them. The tutorial also covers HTML tags as the fundamental building blocks that instruct browsers on how to structure and display content. Learners are guided through hands-on exercises, including creating their first HTML element and building a basic web page.

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ProgrammingDEV Community ·

Jev AI Tool Cuts Agent Search Decision Time Fourfold, Tests Show

Jev is a lightweight AI model designed to return decisions, scores, or true-or-false outputs rather than generating long-form text, making it significantly faster and cheaper than general-purpose models. A team working on open-source search projects integrated Jev into three of their systems to evaluate its performance quantitatively. In one key test using 100 multi-hop questions from the DeepSearcher project, Jev matched a DeepSeek model's retrieval quality — both achieving 93.25% Recall@5 — while cutting decision response time from 2.23 seconds to 0.55 seconds. The estimated cost per decision also dropped to roughly one-seventh of the original. Further experiments explored whether Jev could replace dedicated rerankers in more specialized tasks such as agent memory retrieval for coding assistants.

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ProgrammingDEV Community ·

TypeSafe AI Launches Jev, a Decision-Only AI Model That Never Generates Text

San Francisco startup TypeSafe AI emerged from stealth on September 15, 2026, unveiling a model called Jev and a new category it terms 'System One models.' Unlike conventional large language models, Jev does not generate text; instead, it accepts a block of input and a set of predefined questions, then returns a scored answer for each question in a single fast pass. The model is designed for high-volume, low-cost classification and decision-making tasks embedded inside software pipelines. TypeSafe draws its conceptual framing from psychologist Daniel Kahneman's distinction between fast intuitive judgment and slow deliberate reasoning, arguing that most software decisions fall into the former category. The company, founded by Diogo Almeida, is betting that drastically reducing the cost per decision will unlock entirely new categories of AI-assisted logic that were previously too expensive to automate.

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