What is State Pattern? The State pattern is a behavioral design pattern that allows an object to alter its behavior when its internal state changes. It appears as if the object changed its class. Think of it like a vending machine - it behaves differently when it’s waiting for coins, has coins inserted, is dispensing a product, or is out of stock. Each state has its own set of valid operations and transitions....
What is Template Method Pattern? The Template Method pattern is a behavioral design pattern that defines the skeleton of an algorithm in a base class and lets subclasses override specific steps without changing the algorithm’s structure. Think of it like a recipe - the overall cooking process is the same (prepare ingredients, cook, serve), but the specific steps can vary depending on what you’re making. In Go, since we don’t have traditional inheritance, we implement this pattern using composition and interfaces, which actually makes it more flexible and idiomatic....
What is Command Pattern? The Command pattern is a behavioral design pattern that turns a request into a stand-alone object containing all information about the request. This transformation allows you to parameterize methods with different requests, delay or queue a request’s execution, and support undoable operations. Think of it like a remote control - each button is a command that encapsulates the action to be performed on a device. I’ll demonstrate how this pattern can help you build flexible, undoable, and queueable operations in Go applications....
What is Proxy Pattern? The Proxy pattern is a structural design pattern that provides a placeholder or surrogate for another object to control access to it. Think of it like a security guard at a building entrance - they control who can enter, when they can enter, and might even log who visited. The proxy acts as an intermediary that can add functionality like caching, logging, access control, or lazy loading without changing the original object....
What is Facade Pattern? The Facade pattern is a structural design pattern that provides a simplified interface to a complex subsystem. It acts like a friendly receptionist at a large corporation - instead of navigating through multiple departments and complex procedures, you just tell the receptionist what you need, and they handle all the complexity behind the scenes. I’ll demonstrate how this pattern can dramatically simplify client code and hide the complexity of intricate systems in Go applications....
What is Decorator Pattern? The Decorator pattern is a structural design pattern that allows you to add new functionality to objects dynamically without altering their structure. It provides a flexible alternative to subclassing for extending functionality. Think of it like adding layers of clothing - each layer adds functionality (warmth, style, protection) while keeping the core person unchanged. I’ll show you how this pattern can help you build flexible, composable systems in Go that follow the open/closed principle....
What is Prototype Pattern? The Prototype pattern is a creational design pattern that allows you to create new objects by cloning existing instances rather than creating them from scratch. It’s particularly useful when object creation is expensive or complex, and you want to avoid the overhead of initializing objects repeatedly. Think of it like having a template or blueprint that you can copy and modify as needed. I’ll demonstrate how this pattern can significantly improve performance and simplify object creation in Go applications....
What is Builder Pattern? The Builder pattern is a creational design pattern that constructs complex objects step by step. It allows you to produce different types and representations of an object using the same construction code. Think of it like assembling a custom computer - you choose the CPU, RAM, storage, and graphics card piece by piece to build exactly what you need. I’ll demonstrate how this pattern can make your Go code more readable and maintainable when dealing with complex object creation....
What is Strategy Pattern? The Strategy pattern is a behavioral design pattern that defines a family of algorithms, encapsulates each one, and makes them interchangeable. It lets you select algorithms at runtime without altering the code that uses them. Think of it like choosing different routes to reach the same destination - each route (strategy) gets you there, but some might be faster, cheaper, or more scenic. I’ll show you how this pattern can make your Go code more flexible and maintainable through practical examples....
What is Observer Pattern? The Observer pattern is a behavioral design pattern that defines a one-to-many dependency between objects. When one object (the subject) changes state, all its dependents (observers) are notified and updated automatically. Think of it like a newsletter subscription - when new content is published, all subscribers get notified. I’ll demonstrate this pattern with a practical scenario that shows how powerful it can be in Go applications....