Programming

Use JSONata to filter an unordered array and return a specific IP address. Covers predicate queries, $filter, $contains, $indexOf and regex $match examples.

Fix 'unresolved reference: streak' error in discord.py roulette command. Implement per-user streak tracking with streak.json: reset on hit, increment on miss. Load, update, save for persistence in Discord bots.

Learn microservices patterns to combine Order and Payment in a single service using modular monolith, bounded contexts, ports-and-adapters, and saga patterns for clean boundaries and easy future extraction into independent microservices.

Benefits of dotnet user secrets over a gitignored appsettings.Development.json: security, per-developer scope, tooling, env var comparison, and local secrets best practices.

How the Linux kernel build system uses built-in.a and KBUILD_VMLINUX_LIBS to link object files into vmlinux, and how built-in drivers differ from modules.

Resolve C++ 'undefined reference to' errors when one .cpp file can't access functions from another. Learn header declarations, proper linking with g++, makefiles, IDE setup, and common pitfalls for multi-file compilation.

TrnCodeCode values in Jack Henry SilverLake are FI-specific and not public. Use ParmValSrch (ParmName='TranCodeCode'), AcctHist/AcctRecon, or TrnAdd test posts.

Learn to unblock epoll_wait or kevent for graceful shutdown in Go event loops. Use eventfd, self-pipe like Go runtime and evio. Handle signals, drain connections in epoll server or kqueue setups.

Spawn multiple road markings in p5.js using an array. Use frameCount to spawn, safely remove off-screen items, and cap the array at 20 for performance.

Learn how to compare a u16 value to a #[repr(u16)] Rust enum variant like packet types from devices. Use casting with 'as u16', pattern matching, or TryFrom for idiomatic, safe comparisons without PartialEq errors.

Learn how to format XML with Prettier XML plugin, handling inline vs block elements correctly. Preserve whitespace using xmlWhitespaceSensitivity, prettier-ignore, xml:space, and CI-ready alternatives like xml-formatter or xmllint.

Make Spring WebClient use a proxy with Reactor Netty: configure the proxy in tcpConfiguration, tune timeouts, and add auth or DNS fixes to avoid proxy timeouts.

Why OpenCV template matching fails for C++ object detection and how to fix it: multi-scale, edge preprocessing, robust thresholds, or feature-based methods.

Efficient methods to find duplicates in Python lists using sets, collections.Counter or sorting. Handles unhashable items and covers time and space complexity.

Assign stable UUIDs, expose an app-level resolver, and return NSUniqueIDSpecifier so AppleScript recognizes shared Cocoa objects as identical. Fast and stable.

Model office hours, lunch breaks and weekends in MiniZinc using cumulatives. Time-compression, per-time capacities, and task-splitting to allow resumes.

Practical guide to sink marks defect detection on chair seats using classical CV and anomaly detection. Works with very small datasets (15 normal, 3 defects).

Fix Blazor components generated by Roslyn analyzer that compile but render nothing. Learn why analyzers fail, switch to source generators, debug steps, and build settings for proper Blazor rendering.

Discover interactive graph editors for GraphViz DOT files that support importing, editing node positions, connections, and exporting back to DOT. Try yEd Graph Editor, qvge, Graphviz Visual Editor, Edotor for reliable round-trip editing.

Handle SIGINT gracefully in Node.js TypeScript CLI apps using Commander.js. Finish database updates, per-item calculations, flush stdout/stderr logs, and ensure shell prompt returns only after complete shutdown—no more lost logs or early prompts.