- React Native – Modals, Sheets and Overlays
React Native's `Modal` is a real native window, which is why there is no `createPortal` in a React Native codebase — the z-index wars simply do not happen. Building a bottom sheet, the three things a web modal library gave you for free and you now wire by hand (Android's back button, tap-the-backdrop, the keyboard), and toasts that need no portal at all.
- Collections
Collections are the containers you reach for in every program: a list of orders, a set of tags, a map from id to customer. Java gives you four shapes and several implementations of each. Picking one should take about five seconds, and this post is mostly about making that true. The four shapes…
- What a Data Structure Actually Is
A data structure is a decision about how to lay data out in memory, and an algorithm is a decision about how to walk it. Why there is no best structure, the four questions that pick one, and the Java collection each choice maps onto.
- Angular – Signals
Signals are how Angular tracks state now, and they are the biggest change to the framework in years. What a signal is, `signal()`, `set()` and `update()`, why reading one inside a template subscribes that template to it, and how signals let Angular skip change detection for everything that did not change.
- Docker – Multi-Stage Builds
Build in one image, ship from another. The pizza API compiles with Maven and a full JDK, then copies one jar into a JRE image — no Maven, no source, no build cache in the result. The frontends do the same with Node and nginx. Named stages, `COPY --from`, and stopping at a stage with `--target`.