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.
Hydration mismatches occur when the HTML generated by the server does not match what React expects during the client’s initial render. React’s hydrateRoot treats this as a bug, not a feature. In development, it warns about the mismatch; in production, it may fall back to client rendering from the nearest Suspense boundary, which discards the…
The borrow checker does not run on the HIR. It runs on the MIR, a representation that is small enough, explicit enough, and control-flow-based enough to make the borrow checker’s analysis tractable. The MIR is the compiler’s last representation before code generation, and the borrow checker’s phases—dataflow, region inference, and the final error walk—operate on…
The query execution engine is the component that takes the physical plan chosen by the optimizer and actually runs it. The optimizer decides what to do—which join algorithm, which index, which order. The execution engine decides how fast to do it. Two execution models dominate the landscape: the Volcano iterator model and vectorized execution. The…
An Angular application runs in more than one place. It runs on a developer’s laptop, on a staging server, and in production. Each environment has different settings: a different API URL, a different feature flag state, a different logging level. The application code should not change between environments. Only the configuration should. Environment configuration is…
Hydration has historically been an all-or-nothing operation. The server sends HTML, the browser parses it, and React attaches event handlers to the entire tree before any part of the page becomes interactive. In a large application, the JavaScript bundle can be hundreds of kilobytes, and the main thread can be blocked for hundreds of milliseconds…
Rust offers two mechanisms for polymorphism, and the choice between them determines what the compiler generates. Monomorphization produces a separate copy of the function for every concrete type it is called with, enabling inlining and constant propagation at the cost of code size. Dynamic dispatch produces a single copy that consults a vtable at runtime,…
A B-tree index answers one question well: does this value fall within this ordered range? It is the correct index for equality and range predicates on scalar columns, and it is the default because most queries ask exactly that question. But a query that asks “which documents contain the word ‘index’” or “which geometric shapes…
An Angular application is not the same in development as it is in production. The development build is large, readable, and optimized for fast rebuilds. The production build is small, minified, and optimized for fast delivery to the user. The difference between the two is the build configuration. The Angular CLI applies a set of…
Static Site Generation produces the HTML for every route at build time. Each URL maps to a file on disk that a CDN can serve from cache in tens of milliseconds, regardless of where the user is or how many other requests are in flight. The server does no work per request, so Time to…
Clippy is not a separate linter that happens to understand Rust. It is a collection of lint passes that run inside the compiler, using the same HIR and type information that the rest of rustc uses. Adding a custom lint means writing a pass that implements EarlyLintPass or LateLintPass, registering it with the compiler’s lint…