list of programming languages
A value has a type. The type determines what the value can do: a string can be concatenated, a number can be added, a date can be compared to another date. When a value needs to be used in a context where its type is not accepted, it must be converted. SQL provides two functions…
An API client is the layer of code that talks to a backend. It builds the request, sends it, parses the response, and hands the result back to the caller. In an untyped client, the request URL is a string, the response is any, and a typo in the path, a missing field, or a…
These four longhand properties give you precise control over how transitions behave — which properties animate, how long they take, when they start, and how discrete changes are handled. Overview of Properties Property Description Default transition-property Which properties to animate all transition-duration How long the transition takes 0s transition-delay Wait before starting 0s transition-behavior How…
The previous chapter established that isolates are the correct tool for CPU-bound work and that Isolate.spawn is the low-level primitive for creating them. That primitive is verbose. Spawning an isolate, wiring up a ReceivePort, listening for the result, closing the port, and handling errors takes dozens of lines for what is conceptually a single question:…
JavaScript is single-threaded — it runs one piece of code at a time. Yet it can handle clicks, timers, network requests, and animations without freezing. The event loop is how. It’s the mechanism that lets JavaScript juggle many tasks on a single thread. Key point: JavaScript has one call stack, one heap, and a task…
Authentication answers who the user is. Authorization answers what the user may do. The two are separate concerns, and conflating them produces systems where permissions are scattered across route handlers, hidden in conditionals, and impossible to audit. Two models dominate the field. Role-Based Access Control assigns permissions to roles and roles to users; it is…
Rust’s default allocation strategy is the stack. Local variables, function arguments, and fixed-size values live there, and their size must be known at compile time. Some values do not fit that model: a recursive type whose size depends on itself, a value too large to pass by copy, or a value that needs a stable…
A window function computes a value across a set of rows without collapsing them into a single row. An aggregate function with GROUP BY produces one row per group; a window function produces one row per input row, with the computed value attached. This is the difference between “the average salary of the department” and…
TypeScript’s type system is erased at runtime. When data arrives from an API, a form, or a file, the type annotation is a claim, not a check. A response typed as User is not validated to be a User — if the server sends a different shape, the mismatch appears somewhere deep in the application,…
The animation property is one of the most powerful tools in CSS. It lets you create complex, multi-step animations — with full control over timing, repetition, direction, and more. What is an Animation? An animation in CSS is defined by two parts: Unlike transitions (which animate between two states), animations can have many stages and…