Recent Tutorials

Fixing the "Namespace Not Specified" Error in React Native and Expo Android Builds If you recently upgraded a project to React Native 0.73+ or bumped your Expo SDK to version 50+, you may have run into an Android build error that looks something li...

You know the feeling. Someone shares a query in Slack, or you open a .sql file left behind by a developer who's long gone, and it's just... one giant wall of text. Lowercase here, uppercase there, no line breaks, five joins crammed into a single sent...

Level: Intermediate · Time: 7 min · Outcome: A mental model and three guards for unattended cron jobs There's a gap between a script that works when you run it and a script that survives running unattended for a year. The first only has to succeed o...

The Crash You pull down a fresh React Native repo, or you upgrade your Expo project, navigate to your ios directory, and run your standard installation command: pod install Instead of a clean build, your terminal drops a wall of text pointing to...

Three Lines of Bash Stand Between Your Cron Job and a Silent Outage Level: Intermediate · Time: 6 min · Outcome: A hardened, ShellCheck-clean cron wrapper generated for you Three separate incidents taught me the same lesson over about a year. A /1...

In Part 1https://coderlegion.com/21935/ai-fundamentals-part-1-from-prompt-to-response, we learned how an LLM turns your prompt into a response. It all comes down to predicting one token at a time using the information available in its context windo...

AI is becoming a regular part of software development. Whether you're building chatbots, code assistants, search experiences, or internal tools, you'll come across terms like tokens, context window, attention, and temperature. While you don't need t...

If you are running a large production build or a data-heavy script in Node.js, you have probably run into this crash: Plaintext FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory The V8 stack...

Half of the memory you are about to hand-write for your agent is already sitting in your codebase. The other half, no indexer will ever find. Both gaps feel identical from the agent's side. It opens every session knowing nothing about your systems, ...

If you've ever tried building an AI agent system in production, you know the pain. During the construction of the agentic radar for Obsolescencehttps://datalaria.com/en/posts/obspart5radaragent/, I faced the problem of connecting Gemini 2.5 with my S...

Picture this. You just learned a cool JavaScript trick. You want to see if it actually works. But you don't have a code editor open. You don't want to set up a whole project just to test three lines of code. Sound familiar? Here's the good news: y...

How to Fix MismatchSenderId in Expo EAS Push Notifications Across Multiple Environments If you are managing multiple environments Staging, Preview, Production in a React Native Expo app, setting up Firebase Cloud Messaging FCM can quickly turn into...

Your AI agent fails decisions for the same four reasons a bad manager does. A bigger model fixes none of them. Not because the model is dumb. Because nothing in its loop forces it to widen its options, look for evidence it is wrong, or check itself ...

A /1 rsync took our staging box to a load average of 41 one afternoon, and it took me longer than I want to admit to work out why. The sync normally finished in about twenty seconds. That day the backup target's NFS mount went sluggish, the sync star...

My AI agents could finish any task I handed them. Not one of them could tell me the task was a waste of a month. That gap was never about model quality. It was about which layer I aimed them at. I had handed over execution: write the draft, run the ...

How to Fix "resource drawable/splashscreenlogo not found" After an Expo SDK Upgrade Upgrading your Expo SDK version to keep up with the latest App Store and Google Play requirements is usually a smooth process—until Gradle decides to punch you in t...

!Image descriptionhttps://dev-to-uploads.s3.us-east-2.amazonaws.com/uploads/articles/jjj67shxjcpjhbw1yg4b.png Introduction Handling massive media datasets, virtual machine images, or database backups within a TypeScript backend is notoriously challe...

I meant to delete the .cache files under a data directory. The server had been running for two months and the cache layer had grown to about 14GB. The application team told me it was safe to purge it — they'd rebuilt the cache logic and the old files...

Knowledge is not flat. It has an address book, and the closest door comes first. What ran and worked in your environment beats what you wrote down. What you wrote down beats what a teammate remembers. What a teammate remembers beats the top search r...

ORA-30699 - Network connection failed. Connection Timed out. I was playing around with Oracle APEX's new AI features on a freshly booted Oracle Linux 9 VM as the new update support many new AI providers and it has a built in test button, I Filled th...