Design patterns are used to represent some of the best practices adopted by experienced software developers. A design pattern names motivate and explain a general design addressing recurring problems in these systems.
The Most Important Design Patterns
Singleton
The singleton pattern can be a useful tool in reducing the risk of instantiating objects. It’s especially helpful when you need only one copy to coordinate actions across your system, such as databases or caches that have limited access from multiple threads at once.
Factory Method
A software factory produces objects without specifying their class. This can be done using a “factory method” instead of the constructor, making it possible for these factories to create different kinds or classes of things from an abstract set in code alone!
Strategy
The strategy pattern is a great way to group related algorithms under an abstraction, which allows switching out one policy for another without changing the client code. Instead of directly implementing each individual algorithm yourself, runtime instructions specify which policies should be executed when your program runs – it’s like having instant flexibility!
Observer
This pattern is a one-to-many dependency between the objects, so all dependents are notified when one object changes state. This typically happens because you call their methods, and it’s done for simplicity in this case where we may be following someone on Twitter by simply observing updates from them as though they were text messages being sent our way!
Builder
As the name implies, builders are tools that can simplify complex tasks by breaking them down into a series of easy steps. A composite of an aggregate object is what most builders will typically build, and it’s easy for us as developers because we don’t have to create our own container classes from scratch with all these methods – rather, they’re already there!
State
The state pattern encapsulates a machine’s various states and allows an object to alter its behavior when its internal state changes. As it is called in pattern-speak, the machine or the context can take actions that propel it into different states. The code becomes littered and inflexible without the use of patterns.
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