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.
A search box that stutters on every keystroke is one of the most common performance failures in React applications. The user types a letter, the input freezes for a moment, then the letter appears. They type another, and it happens again. The cause is almost always the same: an expensive computation or render is happening…
Every closure in Rust implements one or more of three traits: Fn, FnMut, and FnOnce. These traits describe how the closure uses the values it captures from its environment. A closure that only reads its captures implements Fn. A closure that mutates its captures implements FnMut. A closure that consumes its captures implements FnOnce. The…
Dates and times are not numbers, but they behave like them in some ways and unlike them in others. Adding a day to a date is not the same as adding 1 to an integer, because months have different lengths and leap years exist. Subtracting two dates produces an interval, not a number. Extracting the…
A headless component library ships behavior without appearance. It handles keyboard navigation, focus management, ARIA attributes, and state transitions, but it does not dictate what the component looks like. The consumer supplies the styling. This separation is powerful because it means one library can serve React, Vue, and Svelte applications without shipping framework-specific markup, and…
Dependency injection is the practice of passing a class its dependencies rather than letting it construct them itself. Instead of a UserService calling new Database() internally, it receives a Database instance as a constructor argument. The benefit is not aesthetic — it is that the dependency can be swapped for a test double, a different…
Pinia is the official state management library for Vue, and it has largely replaced Vuex as the default choice for new Vue 3 applications. Its core API is built around a single function: defineStore(). This function creates a store definition—a reusable, type-safe container for state, computed values, and methods that can be shared across components…
The basic signal API — signal, computed, effect — covers the common cases. The advanced patterns cover the cases where the state is more complex: state that derives from an input and resets when the input changes, state that is written asynchronously, state that depends on a resource, state that is stored in a service…
The translate() and translate3d() functions move elements from their original position — horizontally, vertically, or in 3D space. Unlike position or margin, translation doesn’t affect the layout of other elements. Overview of Functions Function Dimensions Values Description translate() 2D x or x, y Moves along X and Y translate3d() 3D x, y, z Moves along…
Dart executes application code on a single thread. There is no parallelism in the sense that two pieces of Dart code run at the same instant on the same isolate. Yet Dart programs handle thousands of concurrent operations: network requests, timers, file reads, user input, and rendering frames. The mechanism that makes this possible is…
A container is a process, not a virtual machine. It runs directly on the host kernel, and the kernel does not distinguish between a process running in a container and a process running on the host. The only thing separating them is a set of kernel features: namespaces, cgroups, and capabilities. Capabilities are the most…