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.
A SELECT statement returns rows. Without an ORDER BY clause, the order of those rows is undefined. The database may return them in the order they were inserted, in the order they were found on disk, or in an order determined by the query plan. The order is not guaranteed, and it can change between…
A border is part of an element’s geometry. An outline is a line drawn around it without affecting layout. A ring is a box-shadow that looks like a border. These three mechanisms serve different purposes, and Tailwind exposes each through a distinct set of utilities. The distinctions matter because choosing the wrong one produces layout…
Inheritance is how one class reuses and extends another — a child class gets the parent’s members and can add or override them. Polymorphism is what that enables at use time — the same call behaves differently depending on the actual object, without the caller knowing or caring which subclass it is. Together they’re the…
A computed derives a value. A watcher reacts to a change. The distinction matters: the computed is for the derived state, and the watcher is for the side effect that runs when a reactive value changes. The watch() function is the Composition API’s mechanism for the side effects. It takes a source, a callback, and…
A route that always renders the same thing is limited. Real apps pass data through the URL — /users/42 shows user 42, /search?q=hello runs a search, /products?page=2&sort=price paginates and sorts. Angular’s router exposes that data through route parameters and query parameters. Route params are part of the path itself; query params come after the ?….
These properties control the spacing between grid tracks (rows and columns). They’re essential for creating clean, well-spaced grid layouts without using margins on individual items. Overview of Properties Property Description row-gap Space between rows column-gap Space between columns gap Shorthand for row-gap and column-gap 1. row-gap The row-gap property specifies the space between each row…
Inheritance is the mechanism by which a class acquires the members of another class. It is the foundation of polymorphism in Dart, the way a Circle can be treated as a Shape, the way a Manager can be treated as an Employee. But inheritance in Dart has rules that differ from other object-oriented languages. There…
The base image is the first decision in any Dockerfile, and it is the one that is hardest to reverse. It determines the C library, the package manager, the shell, the attack surface, and the fundamental compatibility of everything that follows. A choice made casually in a FROM line ripples through every build, every scan,…
The <video>, <audio>, and <source> elements allow you to embed multimedia content directly into your web pages without requiring third-party plugins. They provide native playback controls and support for multiple formats. Overview of Multimedia Elements Element Purpose Example <video> Embeds video content <video src=”video.mp4″ controls></video> <audio> Embeds audio content <audio src=”audio.mp3″ controls></audio> <source> Specifies media…
Rest parameters provide a way to handle an indefinite number of arguments as an array. They were introduced in ES6 (ECMAScript 2015) and offer a more concise syntax for working with functions that accept a variable number of arguments. A Quick Look at the Examples a. Rest Parameters Introduction Rest parameters provide a way to…