Lesson 4.5 of the JavaScript tutorial — why composition (HAS-A) beats inheritance (IS-A), how to build mixins as plain objects or class-returning functions, and the functional-composition style that frameworks like React and Redux use.
JavaScript Mixins and Composition: When Inheritance is the Wrong Tool Read More »
Lesson 4.4 of the JavaScript tutorial — private fields and methods with the # syntax, static private fields, static blocks for class-level initialization, and the encapsulation patterns modern JS classes finally support natively.
JavaScript Private Fields and Static Members: True Encapsulation with #name and static Read More »
Lesson 4.2 of the JavaScript tutorial — JavaScript classes in depth: constructors, methods, field syntax, static members, inheritance with extends and super, and when to skip classes for plain objects + functions.
Lesson 3.4 of the JavaScript tutorial — property descriptors (value, writable, enumerable, configurable), getters and setters, Object.freeze/seal/preventExtensions, and how the descriptor model explains spread, JSON, and reactivity libraries.
Lesson 3.3 of the JavaScript tutorial — spread (…) for arrays, objects, and function calls; destructuring for arrays and objects; defaults, renaming, nested patterns, and the rest pattern.
JavaScript Spread and Destructuring: The Modern Way to Compose and Unpack Data Read More »
Lesson 3.2 of the JavaScript tutorial — the full array-method toolkit: map, filter, reduce, find, some, every, the new immutable ones (toSorted, toReversed, with), and a cheatsheet covering 95% of array work.
JavaScript Array Methods Cheatsheet: map, filter, reduce, and the Modern Toolkit Read More »
Lesson 3.1 of the JavaScript tutorial — creating objects (literal, Object.create, class), reading/writing properties, modern shorthand syntax (property, computed, method), method this binding, iteration with Object.entries, and reference semantics.
JavaScript Object Fundamentals: Literals, Properties, Methods, and Shorthand Syntax Read More »
Lesson 7.4 of the JavaScript tutorial — the Fetch API, request/response, the famous res.ok gotcha, sending JSON and FormData bodies, AbortController for cancellation and timeouts, CORS, and a production-ready fetch wrapper in 15 lines.
The JavaScript Fetch API and Network Requests: Modern HTTP from the Browser Read More »
Lesson 7.5 of the JavaScript tutorial — localStorage and sessionStorage in depth: API, lifetimes, synchronicity, security (why XSS makes them risky for auth tokens), cross-tab sync via the storage event, and when to reach for IndexedDB instead.
JavaScript localStorage and sessionStorage: When to Use Each (and When Not To) Read More »
Lesson 7.3 of the JavaScript tutorial — modern HTML forms, collecting input with FormData, validating with the Constraint Validation API, the one-line FormData → JSON pattern, and the UX rules for live validation.
JavaScript Forms and Form Validation: FormData, Constraint API, and Modern Patterns Read More »