DevIdiot!

JS - Array Methods

An array method is simply a function that:Is called on an array (using dot notation: array.methodName())Does something with the array's elementsReturns a result — either a new array, a single value, or undefinedJavaScript Array Methods:1. Adding / Removing Elements (mutate the array):let Actors = ["Surya", "Vikram", "Karthi","Chillian", "Leo"]1. push - Actors.push("Brad Fitt"); // add to the End -[ 'Surya', 'Vikram', 'Karthi', 'Chillian', 'Leo', 'Brad Fitt' ]2.pop - Actors.pop() // removes the

I Built a Free WASD Trainer: Five Arcade Movement Games With Per-Key Stats (No Download)

If you came to PC gaming from a controller, or you just switched keyboards, WASD feels wrong for a while. Your ring finger hunts for A, you overshoot corners, and the only place to practise is inside a match where every mistake costs a round.I run KeyboardTester.click, a collection of free browser hardware tests. Last summer I added a small Pac-Man-style movement game to it. Over the past four weeks it has been the most-clicked page on the whole site from US Google searches, so I rebuilt it into

URL Shortener System Design: How to Build a Scalable System

URL shorteners seem simple, but designing one at scale introduces several interesting engineering challenges.In this guide, we explore:How URL shortening worksUnique short code generationDatabase and API designCaching for fast redirectsScalability and system trade-offsThis is a useful system design problem for developers preparing for technical interviews and learning backend architecture.📚 Read the complete guide:URL Shortener System DesignWhat would you choose for generating unique short URLs:

Scraping to Streaming UI: Firecrawl + Vercel AI SDK on React 19

When building grounding workflows that inspect live web pages before answering, the primary bottleneck is UI delivery latency. Waiting for an external scraper to render JavaScript DOM elements can easily create a 2- to 4-second blank slate before the first token arrives. If your reverse proxy buffers intermediate chunks or if the user cancels mid-stream, client-side React trees often suffer frame drops or unhandled stream rejections.In our integration testing with firecrawl (@mendable/firecrawl-

Fake Invoices, Cracked Roots, and Hardware Agents

AI agents had an impressively normal week, if your definition of normal includes seven models launching businesses that produced $12,431 in fake invoices and exactly $0 in revenue. Spotify offers a much more useful AI story by cutting Claude Code token costs 90% through smarter routing, while Vitest 5 makes testing faster and less miserable when something inevitably explodes.Security and systems brought the plot twists. Matthew McPherrin cracked two 1990s certificate-authority roots on a desktop

Three checkers I wrote, one bug: none of them can tell a mention from a use

I have three checkers guarding my publishing pipeline. A writing linter that scores AI-sounding prose. A substance gate that fails posts without real code. A leak detector that makes sure my private review notes never reach a published article.Different jobs, written weeks apart, two languages. This week all three failed on the same input, in the same way, for the same reason. The inputOne file that is deliberately about the things the checkers look for:<!--REVIEW NOTES - DO NOT PUBLISH-

Two constants in my linter were dead. I obeyed them for three weeks.

I have a script that checks my writing before I publish. It opens with a tidy block of configuration:const TARGET = 2.0; // aim at/below this; above triggers a rewrite passconst EMDASH_MAX = 9; // single digits per postconst BOLD_MAX = 2; // bold phrases per postFor three weeks I have edited posts against those numbers. Keep em-dashes under ten. Keep bold phrases to two. I rewrote sentences, unbolded list headers, and talked myself out of punctuation on the authority of

Understanding the File API: How Browsers Read Files Without a Server

A few years back, I watched a junior dev spend an entire afternoon trying to figure out why his "upload preview" feature hit the server on every file selection, even before the user clicked submit. He'd built a full endpoint just to generate a thumbnail. Turns out he didn't need a server at all. The browser could do it. He just didn't know the File API existed.That moment stuck with me because it's such a common gap. We treat "reading a file" as something that inherently requires a backend, a PO

Alibaba renamed one JavaScript variable and our price field silently dropped to 0%

Quick answerAlibaba's search page used to embed its product data behind a fixed marker: window.__page__data=. It doesn't anymore. Alibaba now ships window.__page__data_sse10._offer_list = {...} — a build-tagged variable name, assigned per sub-key instead of as one blob. A scraper still hunting the old literal string finds nothing, silently falls back to a regex scrape of the raw HTML, and keeps running. Every row still gets a product_id. Almost nothing else does: measured field fill on tha

Why Your OpenAI JSON Calls Randomly Fail with "could not parse JSON body" (And How to Fix It)

``You're calling OpenAI from Node.js. 99% of requests work. Then randomly:BadRequestError: 400 could not parse JSON bodyOr:SyntaxError: Invalid JSON: EOF while parsing an objectOr, if you're using tool calling:Invalid JSON in tool call argumentsYou check your code. Nothing changed. You retry manually — it works. You deploy again. It breaks again. What's actually happeningThese errors are NOT your bugs. They're transient artifacts from:Proxy / network corruption — the request body arrives at

Building a Browser-Based Voxel Editor with React Three Fiber

I have been building VoxelDraft, a voxel editor that runs entirely in the browser without an account or installation.The editor supports block painting, layers, keyframe animation, GIF recording, local projects, and exports for OBJ/MTL, GLB, VOX, Minecraft Schematic, and Roblox RBXL. This post covers the architecture choices that kept those features manageable. Keep edit data serializableThe editable model is an array of plain voxel records rather than a collection of Three.js objects. That

Telstra outage: The night a network decided the year was 2006

<a href="https://news.ycombinator.com/item?id=49748957">Comments</a>

Goose:experimental lang 1.16x faster than C++ and 1.12x than safe Rust, mem safe

<a href="https://news.ycombinator.com/item?id=49748954">Comments</a>

Static Pre-Rendering vs Client-Side React: Maximizing LLM & Googlebot Crawl Budgets

Executive SummaryIn modern enterprise software engineering, building high-performance systems requires more than just calling third-party API wrappers. True competitive advantage comes from architecting custom, low-latency data pipelines and decoupled microservices that guarantee operational resilience, data privacy, and measurable ROI. Key Architectural ConsiderationsWhen engineering custom AI and automation workflows, enterprise development teams must balance speed, security, and sc

Architectural Breakdown: Algorithmic Trading: Debug Your Backtest Before Upgrading Your Model

# Algorithmic Trading: Debug Your Backtest Before Upgrading Your ModelI have stress-tested dozens of "production-ready" algo-trading repos and the pattern is always the same. Quants ship models that look like God's gift to finance until they hit production and their PnL looks like a suicide note

Alibaba releases Qwen 3.8 Omni Flash

<a href="https://news.ycombinator.com/item?id=49747925">Comments</a>

I built a digital city where brands can own the advertising space

Most internet advertising still looks the same.Banners. Sponsored cards. Promoted posts. Rectangles everywhere.I wanted to try something different:What if advertising was a place instead of a box?So I built Swishtown.Swishtown is a fictional digital city where buildings, shops, roads, parks, and other locations can become advertising real estate.A brand can take over a location, place its logo there, and turn that part of the city into a clickable destination.Instead of putting an ad next to the

Introducing DevPipe: One-Click Release Publishing for Open-Source

Hey fellow devs! 🎉Ever spent hours tweaking the same release notes for GitHub, Dev.to, Hashnode, and Reddit? I felt the same, so I built DevPipe – a dashboard that lets you write your draft once and hit publish everywhere in a single click.🚀 Live Demo: devpipe.yessindevs.me💻 Source: github.com/medyass1ne/devpipe How it works1️⃣ Write a standard Markdown draft.2️⃣ DevPipe runs it through a Groq + gpt-oss-120b engine.3️⃣ Choose “First Release” and it rewrites the narrative for each platform,

I built an interactive 3D PC anatomy tool to learn what’s actually inside a computer

I built an interactive 3D PC anatomy tool to learn what’s actually inside a computerI’ve been working on an open-source project called PC Anatomy.The idea is simple: instead of reading a wall of text about PC components, you can explore a PC visually in 3D, click on the different parts, and learn what each component does.I wanted it to feel more like taking apart a computer than reading a hardware guide.It’s still something I’m actively improving, so feedback, feature ideas, issues and contribut

Bonsai 2 27B: Near-Lossless Compression in a 9x Smaller Footprint

<a href="https://news.ycombinator.com/item?id=49746618">Comments</a>