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I Built the Tool I Wish I Had When Learning DSA

After failing 3 coding interviews, I realized the problem wasn't practice it was how I was practicing. I spent 6 months grinding LeetCode before my first FAANG interview. 400+ problems solved. Every "Blind 75" problem is memorized. I felt ready. Then the interviewer asked a sliding window variation I hadn't seen before. I froze. Drew a blank. Bombed the interview. The problem wasn't that I hadn't practiced enough. The problem was that I had practiced incorrectly. I memorized solutions instead of understanding patterns. I can recite code, but I struggle to adapt when problems change slightly. So I built something different. Introducing AlgoPatterns A pattern-first DSA learning platform with visualizations that actually show you how algorithms work. algopatterns.in What Makes It Different 1. Pattern-First, Not Problem-First Most platforms throw 2000+ problems at you and say, "Good Luck." AlgoPatterns organizes everything around 17 core patterns: Two Pointers Sliding Window Binary Search BFS/DFS Dynamic Programming Backtracking And 11 more... Master the patterns, and you can solve any variation. 2. Visualizations That Actually Help We have 50+ interactive visualizers that show algorithms step-by-step: Watch two pointers converge in real-time See the DP table fill cell by cell Trace BFS spreading level by level Visualize the call stack during recursion Reading code is one thing. Seeing it executed is completely different. 3. Curated, Not Overwhelming 315 hand-picked problems organized by pattern. Each problem includes: Company tags (Google, Amazon, Meta, etc.) Frequency indicators Pattern classification Difficulty rating No more random grinding. Practice the right problems in the right order. 4. Real Code Templates Every pattern comes with: Java templates (copy-paste ready) "When to use" indicators Common mistakes to avoid Key insights from each pattern Who It's For Interview preppers who want to learn patterns, not memorize solutions CS students who find textbook expla

2026-06-15 原文 →
AI 资讯

Upcoming Speaking Engagements

This is a current list of where and when I am scheduled to speak: I’m giving a keynote at Cybernation 2026 in Berlin, Germany, on June 24, 2026. I’m speaking at the Potsdam Conference on National Cybersecurity at the Hasso Plattner Institut in Potsdam, Germany. The event runs June 24–25, 2026, and my talk will be the evening of June 24. I’m participating in a panel discussion at the Austrian Institute for International Affairs in Vienna on Thursday, June 25, 2026. I’m speaking at the Digital Humanism Conference in Vienna, Austria, on Friday, June 26, 2026...

2026-06-15 原文 →
AI 资讯

I Built a Web App That Finds the Fairest Meeting Spot for Any Group (and It's Free)

The Problem Nobody Talks About Picture this: You're trying to find a place to meet up with friends. Someone suggests a coffee shop. It's 8 minutes from their house. It's 45 minutes from yours. You say yes anyway, because suggesting a different place feels awkward. This happens all the time — with friends, with remote teams, with family scattered across a city. And the worst part? Most "meet in the middle" suggestions aren't actually in the middle. They're just the geographic midpoint, which completely ignores traffic, transit options, and the fact that roads don't go in straight lines. I got frustrated enough to build something about it. Meet Meetle Meetle is a free web app that finds the fairest meeting spot for any group of people — based on real travel times , not just distance. A Chrome Extension is coming soon so you'll have it one click away in your toolbar. You add everyone's starting location, choose how each person is traveling (driving, walking, or transit), hit Find Meeting Point , and Meetle does the math across every person simultaneously. It then surfaces the best nearby cafés, restaurants, parks, gyms, or whatever venue type you're looking for — ranked by actual fairness. No more "it's fine, I don't mind the drive." Now you have data. How It Actually Works Under the hood, Meetle uses three Google Maps APIs working together: Distance Matrix API calculates travel time from every person's location to every candidate venue, simultaneously. This is the core of the fairness scoring — you can't rank venues fairly without knowing everyone's actual travel time to each one. Places API finds candidate venues near the calculated center point. You can filter by type (coffee, food, parks, gyms, etc.), price level, minimum rating, and whether they're open right now. Maps JavaScript API renders everything visually — the map, the travel zones (isochrones), and the markers for each suggested venue. The scoring works two ways and you can toggle between them: Fairness mo

2026-06-14 原文 →
AI 资讯

Struct Embedding in Go: Composition That Bites When You Reach for Inheritance

Book: The Complete Guide to Go Programming Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You come to Go from a language with classes. You see struct embedding for the first time, and it reads like inheritance. A field with no name, methods that "carry over" to the outer type, a base struct that your type extends. So you write code the way you always have, and most of it works. Then a method does something you did not ask for, a type satisfies an interface you never meant to implement, or two embedded types fight over a name and the compiler shrugs until the exact line that calls it. Embedding is not inheritance. It is composition with a syntax that promotes methods and fields up one level. Once you hold that distinction, the surprises stop being surprises. Here is where they come from. Embedding promotes, it does not subclass Write an embedded field by giving a type with no field name: type Engine struct { Horsepower int } func ( e Engine ) Start () string { return "vroom" } type Car struct { Engine // embedded Brand string } Car now has a Start method and a Horsepower field, both promoted from Engine . You can write car.Start() and car.Horsepower as if they were declared on Car . car := Car { Engine : Engine { Horsepower : 300 }, Brand : "Fiat" } fmt . Println ( car . Start ()) // vroom fmt . Println ( car . Horsepower ) // 300 This is where the inheritance illusion starts. car.Start() is sugar. The compiler rewrites it to car.Engine.Start() . The receiver of Start is still an Engine , never a Car . There is no base class, no super , no virtual dispatch. Engine does not know Car exists. That last point is the one that bites. A promoted method runs against the embedded value, not the outer struct. The method that ignores the outer struct Say you want a stringer on the embe

2026-06-14 原文 →
AI 资讯

defer in Loops: The Resource Leak Go Still Lets You Write

Book: The Complete Guide to Go Programming Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You wrote a function that walks a directory and reads every file. It opened cleanly in review. It passed tests on a fixture folder with three files. Then a customer pointed it at a folder with 20,000 files, and the logs filled with: open /data/batch/img-08431.png: too many open files The code never closed anything early. It deferred every close. And that is exactly the problem. defer runs at function return, not end of iteration defer schedules a call to run when the surrounding function returns. Not when the current block ends. Not when the loop iteration ends. When the function returns. Most of the time that distinction does not matter, because most deferred calls live in short functions that return quickly. Put a defer inside a for loop, though, and every iteration adds one more deferred call to a stack that does not unwind until the whole loop is done and the function exits. Here is the version that ships: func processFiles ( paths [] string ) error { for _ , p := range paths { f , err := os . Open ( p ) if err != nil { return err } defer f . Close () // runs at RETURN, not here if err := handle ( f ); err != nil { return err } } return nil } Read it the way the language reads it. On the first iteration, os.Open returns a file handle and you defer its close. On the second iteration, another handle, another deferred close. By the time the loop has touched 20,000 files, you are holding 20,000 open descriptors, and not one of them closes until processFiles returns. Your process has a file-descriptor limit. On Linux the soft default is often 1024. You blow through it somewhere around the 1024th file, and the error you get back says nothing about defer . It says too many open files , wh

2026-06-14 原文 →
AI 资讯

A Domain Logger Port: Decoupling From PSR-3 Without Losing Context

Book: Decoupled PHP — Clean and Hexagonal Architecture for Applications That Outlive the Framework Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You open a use case that places an order. Near the top of the constructor, alongside the repositories and the payment gateway, sits a Psr\Log\LoggerInterface . The method body calls $this->logger->info(...) three times. It looks harmless. It is the most common way framework concerns leak back into a domain you spent weeks keeping clean. PSR-3 is a fine standard. Monolog is the default implementation in most PHP projects, and it earns that spot. The problem is not the library. The problem is where you point it. When LoggerInterface is a constructor argument in your application layer, your use case now depends on a package whose surface area you do not control, whose log levels you may not want, and whose context conventions are someone else's. The dependency arrow points the wrong way. What PSR-3 drags in Psr\Log\LoggerInterface is eight level methods plus a generic log() . The level taxonomy comes from RFC 5424 syslog: emergency , alert , critical , error , warning , notice , info , debug . That is a system-administration vocabulary. Your domain does not speak it. When a use case calls $this->logger->warning('payment retry') , you have to ask: is a retry a warning or a notice ? The answer is an infrastructure judgment call wearing a domain costume. The method signature also accepts an arbitrary array $context and a string|Stringable $message with {placeholder} interpolation. None of that is something your application code should be deciding. <?php declare ( strict_types = 1 ); namespace App\Application\Order ; use Psr\Log\LoggerInterface ; final readonly class PlaceOrder { public function __construct ( private OrderRepository $ord

2026-06-14 原文 →
AI 资讯

Retries and Circuit Breakers Belong in the Adapter, Not Your Use Case

Book: Decoupled PHP — Clean and Hexagonal Architecture for Applications That Outlive the Framework Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You open a use case that places an order. It loads a customer, builds the order, charges a payment gateway, saves, publishes an event. Clean. Then a sprint ago someone added a retry loop around the charge call, because the gateway flaps under load. Now the use case has a for ($i = 0; $i < 3; $i++) , a usleep() , and a comment that says // gateway is flaky on Mondays . The business rule is buried under retry plumbing. A reader who wants to know what placing an order means has to skip past sleep timers and exception counters to find it. Worse, the next person who adds a second outbound call copies the loop. Soon every call to the network has its own hand-rolled retry, each with a slightly different backoff, none of them tested. The use case learned about transient failure. It should never have. Transient failure is not a business rule A use case answers one question: what does the application do when this thing happens? Place an order. Cancel a subscription. Issue a refund. Those are decisions the business cares about. "The payment gateway returned a 503 and we should try again in 200ms" is not a business decision. It is a property of the network between your process and theirs. The domain does not know the gateway is HTTP. It does not know there is a network at all. It asked a port to charge a customer, and the port either succeeds or raises a domain exception. Here is the port, stated in domain language: <?php declare ( strict_types = 1 ); namespace App\Application\Port ; use App\Domain\Customer\CustomerId ; use App\Domain\Shared\Money ; interface PaymentGateway { public function charge ( CustomerId $customerId , Money $amount , s

2026-06-14 原文 →
AI 资讯

Building CompanioxVPS — I'd Love to Hear What Developers Actually Want From a VPS Platform

I've been working on CompanioxVPS, a VPS and cloud infrastructure platform that aims to make deploying and scaling applications much simpler for developers. Right now, I'm building core features such as: VPS provisioning Load balancing Autoscaling Custom domains Developer APIs Simple billing and infrastructure management Before going too far down the road, I'd love to hear from developers who actively ship products: What do you dislike most about current VPS or cloud providers? What features do you wish existed? What would make you switch to a new platform? What's one thing that would make your deployment workflow significantly easier? I'm also open to connecting with developers, DevOps engineers, and infrastructure enthusiasts who find this space interesting and would like to contribute ideas, provide feedback, or potentially collaborate as the project grows. Still early, still building, and still learning. Every piece of feedback helps shape the direction of CompanioxVPS. Looking forward to hearing your thoughts. 🚀

2026-06-13 原文 →
AI 资讯

My AI System Logged 35,669 LLM Calls. It Still Couldn’t Tell Me What They Cost.

CORE had telemetry. That was the comforting part. Every LLM exchange was being logged. Prompt tokens. Completion tokens. Duration. Cognitive role. Model snapshot. Timestamp. Privacy level. Enough information to reconstruct what the system had asked, which model had answered, and how the autonomous loop had used the result. Then I asked the obvious question: What did the last month of LLM work cost? The database had no answer. Not a bad answer. Not an approximate answer. No answer. The cost_estimate column existed. It was even part of the log model. But across 35,669 recorded LLM calls, it was populated exactly zero times. Every row was NULL. That is the kind of bug that looks small until you understand what kind of system CORE is trying to become. CORE is not just a wrapper around LLM calls. It is a governance runtime for AI-assisted software development. The point is not that an AI writes code. The point is that every AI-produced change must be traceable, authorized, constrained, audited, and defensible. So when cost attribution was missing, this was not just a FinOps bug. It was a governance blind spot. The System Could Explain the Work, But Not the Bill The strange thing was that most of the telemetry was already there. CORE knew which cognitive role made the call. It knew whether the call came from an architect, coder, reviewer, coherence analyst, or some other internal role. It knew which model handled the request. It knew the token counts. It knew when the call happened. That meant I could ask questions like: Which cognitive roles are consuming the most tokens? Which models are being used by which part of the system? Which workflows are driving LLM activity? How much autonomous reasoning happened during a given period? But I could not ask: Which cognitive role costs the most? Did routing this role to a stronger model actually change the cost profile? Did a model swap increase operational cost? Is local inference replacing paid inference in the places where it

2026-06-13 原文 →
AI 资讯

I Built a Coding Mascot Generator with Google AI Studio — Meet Octo-Byte! 🐙

This post is my submission for DEV Education Track: Build Apps with Google AI Studio . What I Built I built MascotCraft Studio , an app that generates a cute mascot character for a coding/tutorial brand using Imagen for the visuals and Gemini for the name and personality bio. Here's the prompt I used: "Please create an app that generates a cute mascot character for a coding/tutorial brand, using Imagen for the visuals and Gemini to create a name and short personality description for the mascot. The user should be able to type in a few style keywords (like 'friendly owl', 'cool robot', 'cheerful fox') and get a unique mascot image along with its name and bio." Gemini went well beyond the basic ask — it added a "Character Designer" with quick preset ideas (Wise Python Owl, Cyberpunk JS Fox, Debugging Robo Kitty, and more), color palette options, multiple visual rendering styles (3D Chibi Toy, Minimal Vector, 16-Bit Retro Pixel, Circular Badge), and even a "Studio Gallery Showcase" using localStorage to save and revisit previously generated mascots. Demo 🔗 Live app: https://cute-coding-mascot-generator-924052444918.us-east1.run.app Using the "3D Chibi Toy" style with keywords for a friendly coding octopus, the app generated Octo-Byte — "Asynchronous learning, multi-threaded fun!" A cheerful deep-sea developer who discovered that having eight arms makes multitasking a breeze, whose tech specialty is multi-threaded asynchronous architecture, and whose favorite pastimes include typing on four mechanical keyboards at once. The artwork came out as a glossy 3D chibi-style purple octopus wearing glasses, sitting in front of a tiny code editor. My Experience Watching Gemini's "Thinking" process work through the build was the most interesting part — it planned out the UI sections, color palettes, and visual styles, then added bonus features I never asked for, like the gallery save feature. The whole thing went from a single paragraph prompt to a fully deployed, live web app in

2026-06-13 原文 →
开发者

Building Dhrishti - Part 3: Testing on a Production Grade System

I was now done with the basic setup. However, during my time working at my startup, I have learnt to think about a project wearing multiple caps. One such aspect was - With Dhrishti running on a server that was already loaded, I did NOT want the tracking application itself to be heavy. I had to set some benchmarks to ensure that Dhrishti did not consume a tonne of space while tracking the metrics. I also had a problem with unresolved requests - in my mock_services, I had a client that was continuously hitting the API Gateway service. I had to fine-tune all the requests so that I could run tests under different loads, but the advantage was that my project was easily able to discern where the client request was coming from. However, in a production scenario, you can never know where a request is coming from - obviously, we cannot resolve different customer IPs to their respective customer names. This was the first problem. I had to specify what a customer was, and what an unknown request was. I came up with the following solution - Any unresolved IPs are going to be added to a table in the UI called unresolved IP table. This would help me with debugging later. Now, any unresolved IPs which also made requests to an ENTRY-POINT into my application could be added as the customers. For this, I very simply had to filter out the unknown IPs, and keep a configurable entry-point in dhrishti.json in which I would add a bunch of entry-points (in the case of my mock micro-service architecture, only 1) Now, I could differentiate between 2 types of unknown IPs - one which was potentially a customer, one which was a background network call, not important to the working system. The next problem was with the client service itself. It was difficult to simulate, say - a million users in my system. I had essentially built a service which was only being used by 1 customer, but how would Dhrishti behave if I added multiple client IPs? Using K6 k6 is a Grafana based application that helps

2026-06-13 原文 →
AI 资讯

Switch an old script from Rhino to the V8 runtime

Originally written for bulldo.gs — republished here with the canonical link pointing home. I want to enable the V8 runtime on an existing Apps Script project so I can use modern JavaScript, but I am worried about breaking things that are already working. // appsscript.json — set runtimeVersion to enable V8 // Rollback: change V8 back to DEPRECATED_ES5 { " timeZone " : " America/New_York " , " dependencies " : {}, " exceptionLogging " : " STACKDRIVER " , " runtimeVersion " : " V8 " } // Code.gs — safe V8-compatible replacement for a common Rhino pattern // Rhino allowed: for each (var item in collection) {} // V8 requires standard for...of instead function listSheetNames () { var ss = SpreadsheetApp . getActiveSpreadsheet (); var names = []; var sheets = ss . getSheets (); for ( var i = 0 ; i < sheets . length ; i ++ ) { names . push ( sheets [ i ]. getName ()); } Logger . log ( names . join ( ' , ' )); } The one-line change and why it is a project-wide bomb Open the Apps Script editor, click Project Settings (the gear icon), and check "Show appsscript.json manifest file in editor." Then open that file and change "runtimeVersion": "DEPRECATED_ES5" to "runtimeVersion": "V8" . Save. That is the entire migration from a settings standpoint. What catches people off guard is the failure mode. V8 parses every .gs file in the project as a unit before running anything. One Rhino-only statement — a for each loop, a __iterator__ method, a Date.prototype.getYear call in an otherwise untouched utility file — causes a syntax or runtime error that prevents the whole script from initializing. Not just the file that contains the bad line. Every function, every trigger, the entire project goes dark. The first time I hit this it took me twenty minutes to figure out why a completely unrelated trigger had stopped firing. The error message pointed at the Rhino syntax in a helper file I had not touched in two years. V8 does not isolate the damage; it fails at parse time, before any executi

2026-06-13 原文 →