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.
TypeScript classes start as JavaScript classes — properties, methods, and constructors — and add a type layer on top. Every property, method parameter, and return value can be typed. The compiler checks that the class is used correctly — that properties are initialized, methods are called with the right arguments, and instances match the class’s…
ref() wraps a value in a reactive object with a .value property. reactive() takes a different approach: it returns a proxy of the object itself, so the object’s properties are accessed directly, without a .value in between. The two functions are the two ways to create reactive state in Vue, and they are not interchangeable….
Chapter 19 covered the basics — what a service is, how to create one, how to inject it with inject() or constructor injection, and where providedIn: ‘root’ fits. This chapter goes deeper into the parts of dependency injection you don’t need every day but that matter when they come up: the parameter decorators that control…
These three properties control how auto-placed grid items are sized and positioned. They’re essential for handling grids where the number of items isn’t known in advance or where you want automatic sizing rules. Overview of Properties Property Description grid-auto-columns Sets the default size for auto-placed columns grid-auto-rows Sets the default size for auto-placed rows grid-auto-flow…
A factory constructor is a constructor that does not create a new instance directly. Instead, it returns an instance, which may be newly created, cached, a subtype, or produced by another class. The factory keyword marks the constructor, and the body returns an object that matches the class type. This flexibility is what makes factory…
Docker’s build cache is the difference between a build that takes ten seconds and one that takes ten minutes. The cache works at the layer level: each instruction in a Dockerfile produces a layer, and Docker reuses a layer if the instruction and its inputs have not changed. The cache is what makes iterative development…
20. Forms Introduction Forms are one of the most important features of HTML. They allow users to input data, make selections, and submit information to a server for processing. From login pages to contact forms, search boxes to file uploads, forms power interactivity on the web. What is an HTML Form? An HTML form is…
Arrays in JavaScript are used to store multiple values in a single variable. They’re fundamental in organizing and managing data in a list-like structure. Arrays are versatile — used to store ordered lists of elements. You can add, remove, and update elements using various methods, iterate with for, for…of, and .forEach(), and use array methods…
Piping is the mechanism that connects a readable stream to a writable stream and moves data between them. The pipe method has been part of Node.js since the earliest versions, and it handles the mechanics that make streaming practical: reading chunks from the source, writing them to the destination, pausing when the destination is full,…
Package lifecycle management extends beyond publishing. A maintainer eventually faces one of three decisions: remove a package entirely, mark it as no longer recommended while keeping it installable, or hand it to someone else. npm provides a distinct command for each, and the registry’s policies determine which commands are even permitted. The default recommendation from…