Tutorials covering programming languages, type systems, architecture, tooling, and the patterns used to build software that lasts. Each chapter is standalone, built around real examples and verified facts.
Playwright is a modern end-to-end testing framework built by Microsoft. It runs tests in real browsers — Chromium, Firefox, and WebKit — and it is designed around a set of principles that make tests reliable: auto-waiting, web-first assertions, and test isolation. Angular has embraced Playwright as a first-class E2E testing solution through a set of…
Concurrent rendering is not a feature that makes React faster. It is a scheduling model that changes when React does its work. The scheduler assigns a priority to every state update, processes the highest-priority work first, and yields to the browser between small slices of work so that user input is never blocked by a…
A bare-metal Rust program runs on hardware that has no operating system. There is no main function called by a runtime, no heap allocator, no file system, and no console. The CPU powers on, reads a vector table from a fixed address, jumps to a reset handler, and begins executing your code. Everything that std…
Multi-Version Concurrency Control is the mechanism that lets a database serve readers and writers simultaneously without locking. A reader sees a consistent snapshot of the data as it existed when its query or transaction started, while a writer modifies the current version. The two never block each other because they are looking at different versions…
TypeScript gives you a type system, not a style guide. The compiler enforces that a string is not a number, but it does not enforce that your interfaces are named consistently, that your functions return early instead of nesting deeply, or that your imports are ordered in a predictable way. Those decisions are conventions, and…
Cypress is the E2E testing framework that the Angular team officially recommends for end-to-end testing. It runs in a real browser, executes the test code in the same run loop as the application, and provides a test runner that shows exactly what happened at every step. The ng add @cypress/schematic command is the official Angular…
Batching is the mechanism by which React groups multiple state updates into a single re-render. Before React 18, batching was limited to updates inside React event handlers. An update inside a setTimeout, a promise callback, or a native event listener triggered a separate render for each update. React 18 extended batching to all update sources,…
![Rust 105 🦀 Custom Memory Allocators (#[global_allocator])](https://tuts.kandz.me/wp-content/uploads/2026/10/Screenshot_20261024_075146-767x577.jpeg)
Every Box, Vec, and String in a Rust program eventually asks the global allocator for memory. By default, that request goes to the system allocator—malloc on Unix, HeapAlloc on Windows—or to jemalloc on some targets. The #[global_allocator] attribute is the mechanism that replaces that default with a custom implementation, routing every heap allocation in the…
Lock escalation, latching, and two-phase locking are three mechanisms that operate at different layers of the database engine, and confusing them is the source of many operational misunderstandings. Lock escalation is a memory optimization: when a single statement accumulates too many row-level locks, the engine converts them into a single table-level lock to reduce the…
TypeScript is a language. Architecture is what you do with it. Two codebases can use identical TypeScript features and produce entirely different results — one maintainable for years, the other collapsing under its own weight within months. The difference is not the syntax. It is the structure: how the code is organized, how dependencies flow,…