- React Native – Safe Areas, Notches and the Keyboard
The screen is not a rectangle you own. A notch, a camera cut-out, the home indicator and rounded corners all eat into it, and the amounts differ per device and orientation — so they cannot be constants. `useSafeAreaInsets`, where the navigation header already handles it for you, and `KeyboardAvoidingView`, which needs different behaviour on each platform to work at all.
- Spring Boot – Aspect-Oriented Programming
Cross-cutting concerns without copying the same five lines into forty methods. Pointcuts, @Around advice and a real timing aspect over the service layer — plus the proxy rule that catches everyone: a self-invocation inside the same class never goes through the proxy, so the aspect simply does not run.
- Java Conditional Statements
Conditionals are how a program chooses. Java gives you three tools — if , the ternary, and switch — and switch changed substantially in recent versions, in a way that removed the language's most notorious source of accidental bugs. if , else if , else The branches are tested top to bottom and the…
- React – Conditional Rendering
Four ways to render something only sometimes — if before the return, the ternary, &&, and returning null — and when each one reads best. Includes the && trap that renders a literal 0 on the page, and the early-return pattern that guards a whole route.
- Angular – Directives
A directive is a component without a template — behaviour you attach to an element you did not write. The built-in attribute directives, writing your own with `@Directive` and an attribute selector, why the work belongs in `afterNextRender` rather than the constructor, input transforms with `booleanAttribute`, and where `host` bindings and `hostDirectives` fit.