Template method is a behavioral design pattern that defines the skeleton of an algorithm in the superclass but lets subclasses override specific steps of the algorithm without changing its structure.
Introduction + demo code↓
#designpatterns #dotnet #csharp #coding #programming
- Template method is a behavioral design pattern that defines the skeleton of an algorithm in the superclass but lets subclasses override specific steps of the algorithm without changing its structure. Introduction + demo code↓ #designpatterns #dotnet #csharp #coding #programming
We can demonstrate Template pattern on a conceptual example in order to see all possible extension points of the pattern. The first step is to define the AbstractClass, which defines the template method, and its concrete implementations.The client code calls the template method to execute the algorithm. Client code does not have to know the concrete class of an object it works with, as long as it works with objects through the interface of their base class.Most of the times, subclasses call methods from a superclass. However, when you use the Template design pattern, a template method (from the superclass ) calls methods from subclasses, this is known as Hollywood Principle – "don’t call us, we'll call you."Use the Template Method pattern when you want to let clients extend only particular steps of an algorithm, but not the whole algorithm or its structure.Use the pattern when you have several classes that contain almost identical algorithms with some minor differences. As a result, you might need to modify all classes when the algorithm changes.+ You can let clients override only certain parts of a large algorithm, making them less affected by changes that happen to other parts of the algorithm + You can pull the duplicate code into a superclass- Some clients may be limited by the provided skeleton of an algorithm - Template methods tend to be harder to maintain the more steps they haveFull implementation of the previously shown example, as well as additional design pattern examples, can be found on github.com/nemanjarogic/D… For more details on design patterns theory check @RefactoringGuru
