![Rust 105 🦀 Custom Memory Allocators (#[global_allocator])](https://tuts.kandz.me/wp-content/uploads/2026/10/Screenshot_20261024_075146-767x577.jpeg)
Every Box, Vec, and String in a Rust program eventually asks the global allocator for memory. By default, that request goes to the system allocator—malloc on Unix, HeapAlloc on Windows—or to jemalloc on some targets. The #[global_allocator] attribute is the mechanism that replaces that default with a custom implementation, routing every heap allocation in the…
A bare-metal Rust program runs on hardware that has no operating system. There is no main function called by a runtime, no heap allocator, no file system, and no console. The CPU powers on, reads a vector table from a fixed address, jumps to a reset handler, and begins executing your code. Everything that std…
WebAssembly is a portable bytecode format that runs in browsers, Node.js, and standalone runtimes. Rust compiles to it efficiently because the language has no garbage collector and produces small binaries. But the raw Wasm interface is narrow: it passes integers and floats, not strings, objects, or DOM nodes. wasm-bindgen is the bridge that lifts that…
Every atomic operation in Rust carries an Ordering argument, and that argument is the entire reason atomics are difficult. The atomicity itself is simple: an operation that cannot be split by another thread. The ordering is where the reasoning lives. It determines which other memory operations the compiler and CPU are allowed to move around…
A lock-free data structure is one where at least one thread can always make progress, even when other threads are stalled, preempted, or killed mid-operation. This guarantee is stronger than a mutex-based structure, where a thread holding the lock can block every other thread indefinitely. The tool that makes lock-free programming possible in Rust is…
Internationalization in React is not a single problem wearing three masks. It is three problems that share a name: translating text, formatting locale-sensitive data like dates and currencies, and structuring the application so the right language reaches the right user. The first two are largely solved by the platform—the browser’s Intl object handles formatting natively—while…
The Server-Client boundary in React Server Components is one-directional by design: the server sends serialized data to the client, and the client cannot reach back into the server’s memory. But the boundary is also a leak surface. A Server Component that fetches a user record and passes it to a Client Component sends every field…
A Server Function is an async function marked with “use server” that a Client Component can call over the network. The client never receives the function’s code; it receives a reference, and when it invokes that reference, React sends a request to the server, executes the function there, and serializes the result back . The…
Partial Prerendering is the rendering model that dissolves the boundary between static and dynamic. In the Next.js App Router, a route is no longer forced to choose one or the other: the server can ship a fully static shell immediately, leaving holes for the personalized or request-dependent sections, and stream those holes in as they…
Incremental Static Regeneration is the bridge between the two extremes of web rendering. Pure static generation produces fast pages but freezes content at build time. Pure server-side rendering produces fresh content but pays a computation cost on every request. ISR takes a third path: it serves static HTML from a cache, and when that cache…