list of programming languages
Node.js runs your JavaScript on a single main thread. This is by design—the event loop handles thousands of concurrent I/O operations without the overhead of thread management. But there is a category of work the event loop cannot save you from: CPU-bound computation. A tight loop calculating a cryptographic hash, parsing a massive JSON payload,…
Rust’s concurrency story rests on two marker traits that have no methods, no runtime cost, and no counterpart in most other languages: Send and Sync. Everything else in this chapter series—threads, channels, mutexes—ultimately depends on the compiler’s ability to reason about which types can cross thread boundaries and which cannot. These two traits are how…
A single Common Table Expression is useful. Two CTEs that reference each other are a pipeline. The first CTE produces an intermediate result, the second consumes it and produces another, and the main query consumes the second. This chaining is what turns a CTE from a readability convenience into a query-organization tool. Each CTE is…
A callback is a function passed to another function to be called later. A higher-order function is a function that takes a function as an argument or returns one. The two are the same idea from different angles: the callback is the function that is passed, and the higher-order function is the function that accepts…
Dart 3.10 and Flutter 3.38 introduced a brand-new official analyzer plugin system, one of the most significant changes to the Dart ecosystem in the area of static analysis. Before it existed, if you needed project-specific lint rules—enforcing a particular design pattern, checking the direction of dependencies between layers, or banning certain third-party APIs—you had essentially…
JavaScript manages memory for you. You create objects, arrays, and closures — and the engine reclaims them when they’re no longer needed. That’s the deal. In exchange, you can’t manually free memory, and you can’t force garbage collection. But you can create leaks, and you can prevent them. Understanding how garbage collection works isn’t about…
A Node.js process runs on a single CPU core. This is not a limitation of the language but a consequence of its architecture: the event loop runs on one thread, and while that thread handles thousands of concurrent I/O operations efficiently, it cannot execute JavaScript in parallel. On a machine with eight cores, a single…
Rust is a language that favors static dispatch. When you write a generic function with a trait bound, the compiler generates a specialized copy of that function for every concrete type that uses it. This is monomorphization, and it costs nothing at runtime: the call is direct, inlinable, and optimizable. But there is a class…
Hierarchical data is data that references itself. An employee has a manager, who is also an employee. A category has a parent category, which is also a category. A part is made of components, which are themselves parts. A comment has a parent comment, which is also a comment. The relationship is recursive: the same…
The DOM is where the browser’s types live. Every element, every event, every property of the window and document has a declaration in the DOM library that TypeScript loads by default. When you write document.getElementById(‘app’), the return type is HTMLElement | null, and the compiler forces you to handle the null. When you write element.addEventListener(‘click’,…