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.
Standalone components are Angular’s answer to the boilerplate that NgModules required for every application. Before them, every component had to be declared in an NgModule, every directive had to be exported from a shared module, and every lazy-loaded route needed its own module. The standalone flag flips the model: a component declares its own dependencies…
CSS 1 IntroductionCSS 2 selectors and commentsCSS 3 unitsCSS 4 colors and color propertiesCSS 5 background related propertiesCSS 6 fonts and font propertiesCSS 7 line height and text decorationCSS 8 text-align, letter-spacing, word-spacing and text-transformCSS 9 text indent, vertical align, text align last, direction propertiesCSS 10 white space, text emphasis and text shadow propertiesCSS 11…
Hand-written FFI bindings are error-prone. A single type mismatch between the Dart declaration and the native function produces undefined behavior, and the compiler cannot catch it. A library with hundreds of functions, structs, and enums would require thousands of lines of hand-written declarations, each of which must match the native header exactly. The ffigen package…
A container image built on an x86_64 laptop runs on an x86_64 server. It does not run on an Apple Silicon Mac, an AWS Graviton instance, or a Raspberry Pi. The binary inside the image is compiled for one CPU architecture, and the kernel rejects it on any other. Multi-platform builds solve this by producing…
JavaScript is garbage-collected — you don’t manage memory manually. But sometimes you need to know when an object is collected, or hold a reference that doesn’t prevent collection. That’s what WeakRef and FinalizationRegistry provide. They’re advanced, rarely needed, and easy to misuse — but essential when the situation calls for them. Key point: WeakRef lets…
A WebSocket connection begins as an HTTP request. The client sends an Upgrade header, the server responds with 101 Switching Protocols, and the TCP socket transitions from request-response to full-duplex messaging. The ws library implements this handshake and the framing that follows. It is the most widely deployed WebSocket library in the Node.js ecosystem, with…
A route has two jobs: match a URL, and produce an element. React Router separates these. The matching is done by the route configuration, and the rendering is done by the element prop on each route. The element is a React element, not a component reference, and it is rendered when the route matches. The…
Rust’s ownership rules guarantee that a value is dropped when its owner goes out of scope. The guarantee holds for trees, stacks, and every structure where ownership is acyclic. It breaks for cycles. When two Rc<T> values point to each other, each keeps the other’s strong count above zero, and neither is dropped. The memory…
The window functions so far access the adjacent rows and the ranked positions. The boundary functions—FIRST_VALUE, LAST_VALUE, and NTH_VALUE—access the specific rows at the edges of the window or at the arbitrary position. They answer the questions “what was the first value?” and “what was the last value?” and “what was the third value?” The…
An aspect ratio is a constraint: this box must be twice as wide as it is tall, regardless of how the content inside it grows. For years, CSS had no direct way to express this. Developers used the padding-bottom hack, where a wrapper’s height was set by a percentage of its width, and the content…