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....
Go Concurrency Patterns Series: ← Select Statement | Series Overview | Fan-Out/Fan-In → What is the Pipeline Pattern? The Pipeline pattern is a powerful way to structure concurrent data processing by breaking work into stages connected by channels. Each stage runs in its own goroutine, receives data from an input channel, processes it, and sends results to an output channel. This creates a chain of processing stages that can run concurrently, dramatically improving throughput....
Go Concurrency Patterns Series: ← Channel Fundamentals | Series Overview | Pipeline Pattern → What is the Select Statement? The select statement is Go’s powerful tool for handling multiple channel operations simultaneously. It’s like a switch statement, but for channels - it allows a goroutine to wait on multiple communication operations and proceed with whichever one becomes ready first. Think of select as a traffic controller at an intersection, managing multiple lanes of traffic (channels) and allowing the first available lane to proceed....
Go Concurrency Patterns Series: ← Goroutine Basics | Series Overview | Select Statement → What are Channels? Channels are Go’s primary mechanism for communication between goroutines. They embody Go’s concurrency philosophy: “Don’t communicate by sharing memory; share memory by communicating.” Think of channels as typed pipes that allow goroutines to safely pass data back and forth. Channels provide both communication and synchronization, making them incredibly powerful for building concurrent applications....
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....
Go Concurrency Patterns Series: Series Overview | Channel Fundamentals → What are Goroutines? Goroutines are lightweight threads managed by the Go runtime. They’re one of Go’s most powerful features, allowing you to write concurrent programs that can handle thousands of simultaneous operations with minimal overhead. Think of goroutines as extremely efficient workers that can run independently while sharing the same memory space. Unlike traditional threads that typically consume 1-2MB of memory each, goroutines start with just 2KB of stack space and grow as needed....
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....