Design Patterns made-easy

Explore creational design patterns, including factory method, abstract factory, builder, prototype, and singleton, and how they improve object creation, flexibility, and decoupling in software design.

Learn how the factory method pattern decouples object creation from use, enabling concrete products like trucks, cars, or ships to be produced by different creators for flexibility and extensibility.

Explore how the abstract factory creates related UI component families, like buttons and windows, through concrete factories, promoting loose coupling and platform-specific styles.

Explore creation methods from static creation method to simple factory, factory method, and abstract factory patterns, and learn how each choice affects design decisions and trade-offs.

Explore the builder design pattern to create complex objects through step-by-step construction with builders, directors, and products, enabling readable, reusable, and flexible object creation.

Explore the prototype design pattern, aka the clone pattern, where objects self-duplicate via a shared clone method to produce deep, independent copies.

Explore the singleton design pattern, which guarantees a single class instance and provides a global access point for shared resources, like a database connection or logger.

Explore structural design patterns as reusable blueprints that organize objects and classes, improve code reuse and reduce coupling, with adapters, bridges, composites, decorators, facades, flyweights, and proxies.

Bridge incompatible interfaces with the adapter pattern, translating XML to JSON and using object or class adapters to aid legacy systems and testing.

Master the bridge design pattern by splitting complex classes into abstraction and implementation hierarchies, using composition to decouple high-level logic from details and manage orthogonal dimensions with runtime switches.

Master the composite design pattern to treat individual leaves and entire branches uniformly within tree-like hierarchies, using a common interface, recursion, and delegation.

Explore the decorator design pattern, using wrapper objects to add encryption, compression, or logging to a file data source through a flexible, layered, runtime approach.

Explore the facade design pattern that provides a simplified interface to a complex subsystem, reducing coupling and isolating complexity for easier integration and maintainable code.

Explore the flyweight design pattern to optimize memory by sharing intrinsic data and separating extrinsic context, using factories to manage immutable flyweights in scenarios like bullets and trees.

Explore the proxy design pattern as a stand-in that controls access to resource-intensive objects through a proxy interface, enabling lazy loading, caching, and secure or remote access.

Explore behavioral design patterns like chain of responsibility, command, iterator, mediator, and observer to build flexible, maintainable software with loosely coupled components.

Explore how the chain of responsibility links specialized handlers into a flexible request-processing chain, guiding authentication, authorization, data validation, and GUI help flows.

Encapsulate each request as a self-contained command object with an execute method. Link user interface elements to invokers, decouple logic from actions, and enable undo with state snapshots.

Explore the iterator design pattern, a navigator that traverses any collection, list, tree, or graph, providing diverse views without exposing the data structure.

Master the mediator design pattern to centralize communication among UI components, reduce tight coupling, and boost reuse via an authentication dialogue, avoiding god-object risk with lean mediation and open-closed principles.

Explore the memento design pattern to save and restore an object's state, using originator, memento, and caretaker. Discover how immutable snapshots enable reliable undo and state history management.

Explore the observer design pattern as a subscription model where a publisher notifies subscribers of events, managing one-to-many relationships with a subscriber interface, concrete listeners, and open-closed flexibility.

Explore the state design pattern, where a context delegates behavior to state objects, using a state interface and concrete states to tame conditional logic.

Leverage the strategy design pattern to swap routing algorithms at runtime, with a navigator as context and concrete strategies for driving, walking, public transport, all implementing a build route method.

Explore the template method pattern by defining a template method in an abstract class, while concrete format classes customize steps for pdfs, docs, and csvs, reducing duplication and ensuring consistency.

Explore how the visitor pattern separates algorithms from objects, allowing new operations like print or export to be added via visitor classes without changing existing structures.