Tutorials covering programming languages, type systems, architecture, tooling, and the patterns used to build software that lasts. Each chapter is standalone, built around real examples and verified facts.
Dart’s single-threaded event loop is efficient for I/O-bound work, but it cannot help with CPU-bound work. A long computation blocks the event loop, freezes the UI, and prevents timers from firing. The solution is not threads, because Dart does not expose shared-memory threads. The solution is isolates: independent units of execution with their own heap,…
Capabilities restrict which operations a process may perform. Seccomp restricts which system calls a process may make. Linux Security Modules go one layer deeper: they restrict which resources a process may touch, even when the operation is permitted and the syscall is allowed. AppArmor does this by matching file paths and network rules. SELinux does…
A generator is a function that can pause and resume. Where a regular function runs to completion, a generator produces a sequence of values, one at a time, on demand. The function* syntax and yield keyword make this possible. Key point: Generators return an iterator. You pull values out one at a time with .next(),…
Social login is the feature that lets users click “Sign in with Google” and arrive at your application without a password. Underneath, two protocols do the work. OAuth2 is the authorization framework that grants your application limited access to a user’s resources on another service. OpenID Connect is a thin identity layer on top of…
React is designed around a simple rule: components read data from props, state, and context. But real applications rarely stay inside that boundary. A WebSocket connection carries live messages. A browser API exposes the user’s online status. A third-party state library manages its own store outside React. When a component needs to read a value…
The previous chapter established the iterator trait and the split between adapters and consumers. This chapter applies that machinery to real collections. Vec, HashMap, HashSet, BTreeMap, String, and slices all implement IntoIterator, and each one offers a different set of iteration forms. Knowing which iterator each collection produces, what type its items are, and how…
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…
A component library is usually something you install. You add a dependency, import a Button, and accept whatever the library decided a button should be. The shadcn/ui pattern inverts this. Instead of installing a package, you copy the component’s source into your own project. The code becomes yours. You can edit it, extend it, and…
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…
A Pinia store is not just a passive container. It exposes three powerful methods that let you control its lifecycle and react to its activity: $reset(), $subscribe(), and $onAction(). These methods are what turn a store from a simple data holder into an observable, resettable, and instrumentable part of your application’s architecture. The most important…