Category: Design Patterns
What Is the Template Method Pattern?
A calm, thorough guide to the Template Method design pattern: the recipe-card and morning-routine analogies, what the pattern really is (a behavioral pattern from the 1994 Gang of Four book that defines an algorithm skeleton in a base class while letting subclasses fill in specific steps), the three kinds of…
What Is the Command Pattern?
A calm, thorough guide to the Command design pattern: the TV-remote and permission-slip analogies, what the pattern really is (a behavioral pattern from the 1994 Gang of Four book that wraps a request as a first-class storable object), the four key roles (Command, Receiver, Invoker, Client), an anatomy diagram, a…
What Is the Proxy Pattern?
A calm, thorough guide to the Proxy design pattern: the credit-card and receptionist analogies, what the pattern really is (a structural pattern from the 1994 Gang of Four book that places a stand-in object in front of a real object using the same shared interface), the key roles (Subject, Real…
What Is the God Object Anti-Pattern?
A complete guide to the God Object (God Class / Blob) anti-pattern: the overflowing kitchen-drawer analogy, the formal definition and why it violates the Single Responsibility Principle, the four-step timeline of how one actually forms, the six warning signs (size, naming, dependencies, methods, change risk, testing), a step-by-step StoreManager walkthrough…
What Is an Anti-Pattern?
A complete guide to anti-patterns in software: the hiking-trail-shortcut analogy, the formal definition and its 1995 AntiPatterns-book origin, how anti-patterns actually form (deadline pressure, cargo-culting, local optimization, missing feedback), a side-by-side comparison with code smells, technical debt, bugs, and design patterns, the four-part anatomy every documented anti-pattern shares, the three…
Why Does Dependency Injection Help With Testing?
A complete guide to why Dependency Injection makes testing so much easier: the crash-test-dummy analogy, the specific testing headaches (slow / flaky / unrepeatable / risky) a hardcoded dependency creates, the three core testing reasons DI helps (swappable stand-ins, testing one thing at a time, fast and repeatable results), a…
What Is the MVVM Pattern?
A complete guide to the Model-View-ViewModel architectural pattern: the car-dashboard analogy for automatic data binding, its formal definition and Microsoft/WPF history, the UI-synchronization plumbing problem it solves, the three building blocks (Model, View, ViewModel) with a diagram showing which layer knows about which, a step-by-step profile-editing example with @Observable properties…
Why Is MVC So Popular for Web Applications?
A complete guide to why the Model-View-Controller pattern became the dominant way to organize web applications: the newspaper-office analogy, the specific pressures the web places on software (shared access, multiple screens, constant change, larger teams), the four core reasons MVC took over (clean division of labor, one Model many faces,…