Rust’s async/await syntax looks familiar to anyone who has written asynchronous code in JavaScript or C#, but the execution model underneath is fundamentally different. In most languages, async is built into the runtime: the language ships with an executor, and await hands control to that executor. Rust does not bundle a runtime at all. The…
Dart’s cryptographic ecosystem splits along a clean line: hashing and encryption are different operations with different packages, and confusing them produces insecure code. The crypto package provides one-way hash functions—SHA-256, HMAC—that cannot be reversed. The encrypt package provides two-way symmetric encryption built on PointyCastle, primarily AES with PKCS7 padding . Neither package is a complete…
Dart’s security model forces a distinction that many developers learn the hard way: obfuscation is not encryption, and client-side secrets are never truly secret. Flutter’s obfuscation tool renames symbols to make reverse engineering tedious, but it explicitly does not encrypt resources or protect against a determined attacker . Any key compiled into a binary—even an…
Tree shaking is the Dart AOT compiler’s mechanism for removing code that cannot be reached from any entry point. It is not an optional optimization you enable; it runs automatically in profile and release builds, and it is the primary reason a Flutter release binary is orders of magnitude smaller than the sum of every…
A memory leak in Dart is not an object that was never freed by the garbage collector. It is an object that remains reachable from a GC root long after the application has stopped needing it. The garbage collector does its job perfectly: it collects everything unreachable. The leak exists because something still references the…
Dart DevTools is a suite of debugging and performance tools that ships with the Dart SDK. When your application feels sluggish, consumes too much memory, or exhibits behavior that cannot be explained by reading source code alone, DevTools provides the observational instruments you need to see what the Dart VM is actually doing at runtime….
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…
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…
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:…
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…