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.
CSS-in-JS libraries solve a problem that plain CSS and CSS Modules do not: they let styles depend on JavaScript values—props, state, theme context—without generating an explosion of class names or requiring inline style objects. The two dominant libraries in this space are styled-components and Emotion. They share the same core idea: you write CSS in…
Lifetimes are Rust’s mechanism for tracking how long references remain valid. The basic rules—every reference has a lifetime, the compiler infers them where possible, and explicit annotations are needed when the relationship between input and output lifetimes is ambiguous—are covered in any introduction to the language. The advanced material is about what happens when lifetimes…
An index is only as good as the data structure underneath it. The previous chapter established why indexes exist and how selectivity drives the optimizer’s decisions. This chapter goes one level deeper and examines the three fundamental index structures that relational databases actually implement: the B-tree, the hash table, and the bitmap. Each structure makes…
A Tailwind class list is a small program. The order of the classes does not affect the CSS cascade in most cases, because the utilities are generated in a fixed order and the specificity is the same. The order does affect the readability, the diff, the review, and the merge conflict. Two developers who add…
A TypeScript project starts as a single tsconfig.json and a single src directory. It grows into a monorepo with a shared library, several applications, and the test projects, and the single project’s compilation becomes the bottleneck. Every build recompiles everything, the editor’s IntelliSense slows down, and the changes to one package trigger the rebuilds of…
VitePress and Nuxt both generate static HTML from Vue code, but they target different problems. VitePress is a documentation-first static site generator: Markdown files become pages, a default theme handles navigation and search, and the output is a content-centric site that ships almost no JavaScript beyond hydration . Nuxt is a full-stack Vue framework where…
In the previous chapters, every component you rendered was loaded and initialized as part of the main bundle. Whether the user scrolled to it, clicked it, or never saw it at all, the JavaScript for that component was downloaded, parsed, and executed. @defer changes that contract. It is a declarative block that tells Angular: do…
package:shelf is the Dart team’s official HTTP server library. It is deliberately minimal. Where a framework like Express or Dart Frog provides routing, middleware, and project structure out of the box, Shelf provides a single abstraction—the Handler—and a Pipeline for composing middleware around it . Everything else is assembled from smaller packages: shelf_router for route…
Standard containers share the host kernel. A kernel vulnerability, a misconfigured capability, or an escape exploit in one container can compromise the entire host. Seccomp, AppArmor, and SELinux reduce the attack surface, but they are policies layered on top of the same kernel—they do not change the fundamental architecture. gVisor and Kata Containers take two…
Mocking an external API by stubbing fetch or axios is a trap. The stub intercepts the function call, not the network request. The application’s HTTP client—with its interceptors, retry logic, serialization, and status-code handling—never runs. The test passes, but it is testing a code path that does not exist in production. Mock Service Worker (MSW)…