Easy Learn
A complete guide to the Model-View-Controller architectural pattern: the restaurant analogy, its formal definition and history (Trygve Reenskaug and Smalltalk), the spaghetti-code problem it solves, the three building blocks and their one-way flow of awareness, a step-by-step to-do list example in pseudocode, comparisons with MVP / MVVM / Layered Architecture,…
Both Adapter and Facade wrap existing code, and both make life easier for the caller, but they solve two genuinely different problems. This complete side-by-side guide covers the intent behind each pattern, their building blocks, a same-scenario code walkthrough, a full comparison table, real-world examples, how they cooperate in real…
A complete guide to the Decorator pattern: what it is, the class-explosion problem it solves, its four building blocks (Component, Concrete Component, Decorator, Concrete Decorator), a step-by-step build in pseudocode, comparisons with Subclassing / Strategy / Proxy / Adapter, real-world examples (Java streams, photo filters, middleware), trade-offs, and how it…
A complete guide to the Facade pattern: what it is, the problem it solves, its three roles (Facade, Subsystem, Client), a step-by-step build, comparisons with Adapter/Decorator/Proxy/Mediator, real-world examples, trade-offs, when to use it, common pitfalls, and how it looks across Java, C#, Python, and JavaScript/TypeScript.
A complete guide to design patterns in software development: what they are, their origin in architecture, the Gang of Four catalogue, the anatomy of a pattern, all three families with concrete examples (Singleton, Factory, Builder, Adapter, Decorator, Facade, Observer, Strategy, Template Method), how to choose one, and the pitfalls to…
A complete guide to the three main categories of design patterns: Creational (5), Structural (7), and Behavioral (11). What each family solves, how to choose between them, when categories blend, newer families beyond the Gang of Four, and a walk-through example that uses all three.
A complete guide to the Singleton pattern: what it is, its three-part anatomy, lazy vs eager initialization, the thread-safety race condition and double-checked locking, real-world use cases, why it is controversial, safer alternatives like Dependency Injection, and the trade-offs every engineer should know.
A complete guide to the Factory pattern: what it is, why to delegate object creation, its four roles, three flavors (Simple Factory / Factory Method / Abstract Factory), real-world use cases, its bond with the Open/Closed Principle, and the trade-offs every engineer should know.
A complete guide to the Builder pattern: what it is, how it fixes the telescoping constructor, its four roles, fluent builders, the Director, real-world use cases, differences from Factory and Prototype, and the trade-offs every engineer should know.
A complete guide to the Observer pattern: what it is, how it works, its four roles, push vs pull, real-world use cases, differences from Pub/Sub, common pitfalls, and the trade-offs every engineer should know.