Tutorials covering the frameworks and libraries that shape how modern applications are built — Angular, React, Vue, and the ecosystem tools that surround them. Each chapter is standalone, built around real examples and verified facts.
End-to-end testing is the only layer of the test pyramid that exercises the entire application the way a user does: the browser loads the real bundle, the real router resolves the real URL, the real API calls go over the network, and the real DOM is asserted on after the real React render cycle. Unit…
Vue’s customRef is the escape hatch for creating a ref whose dependency tracking and update triggering are under explicit programmer control. A standard ref calls track() when read and trigger() when written, with no opportunity to intervene. customRef receives those two functions as arguments and returns a get/set pair, allowing the implementation to decide when…
Accessibility is not a feature you add at the end. It is a property of how a component is built. An accessible Angular application works with screen readers, keyboard navigation, and assistive technologies without requiring a separate version or a special mode. The framework provides the tools — the @angular/cdk/a11y package, attribute binding for ARIA,…
The difference between SSR and SSG is not about the code you write. It is about when the HTML is generated. In both cases, React components render on a server, the output is HTML, and the browser receives a page that is already populated with content before any JavaScript runs. The distinction is the trigger:…
Vue’s default reactivity is deep. A ref({ nested: { count: 1 } }) wraps every nested object in a Proxy, so mutating nested.count triggers a re-render. This is convenient, but it is also expensive for large data structures, external library instances, and immutable API responses that will never be mutated internally. shallowRef() and shallowReactive() provide…
Angular Material is the official UI component library for Angular, built and maintained by the Angular team. It implements Google’s Material Design specification, providing a set of high-quality, accessible, and customizable components that integrate deeply with the framework. Unlike third-party libraries that layer on top of Angular, Angular Material is designed alongside it — the…
React Server Components are not a rendering mode. They are a new kind of component. A Server Component runs ahead of time, in an environment separate from the client application and separate from the traditional SSR server, and its code never ships to the browser . That separation is the architectural core. The component can…
Vue’s reactivity system wraps objects in Proxies to track property access and mutation. This is the mechanism that makes the UI reactive, but it is also a mechanism that some objects cannot tolerate. A third-party library instance that performs identity checks, a DOM node that the browser expects to be the exact object it created,…
Angular Material’s theming system was completely rewritten in version 19. The old approach — defining palettes, composing them into a theme map, and passing that map to component mixins — was replaced with a design token system based on Material Design 3 (M3) . The new API generates CSS variables from a single theme configuration…
The rules that separate Server Components from Client Components are not stylistic guidelines. They are enforced by the compiler, the bundler, and the React runtime, and violating them produces build errors or serialization exceptions. The core rule is deceptively simple: a component is a Server Component by default, and it becomes a Client Component only…