The Interpreter Design Pattern Use the Interpreter pattern when you have a language to interpret, and you can represent statements in the language as abstract syntax trees. The Interpreter pattern provides a way to evaluate language grammar or expressions for particular languages. Type: Behavioral Time Complexity: O(n) Efficiency: 4 Learning Difficulty: average 7.4 conceptual: 9 …
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The Iterator Design Pattern Use the Iterator pattern when you want to access the elements of an aggregate object sequentially without exposing its underlying representation. The Iterator pattern provides a way to access the elements of an aggregate object without exposing its underlying structure. Type: Behavioral Time Complexity: O(n) Efficiency: 6 Learning Difficulty: average 4.4 …
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The Factory Method Design Pattern Use the Factory Method pattern when you want to provide a method for creating an object, but allow subclasses to alter the type of created objects. This is particularly useful when a class can’t anticipate the class of objects it must create. The Factory Method pattern defines an interface for …
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The Flyweight Design Pattern Use the Flyweight pattern when you need to improve the efficiency and performance of an object-heavy application by sharing object data. The Flyweight pattern minimizes memory usage or computational expenses by sharing as much as possible with related objects. Type: Structural Time Complexity: O(n) Efficiency: 9 Learning Difficulty: average 6.4 conceptual: …
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The Decorator Design Pattern Use the Decorator pattern when you need to add responsibilities to individual objects dynamically and transparently, without affecting other objects. The Decorator pattern attaches additional responsibilities to an object dynamically. Type: Structural Time Complexity: O(n) Efficiency: 5 Learning Difficulty: average 4.8 conceptual: 5 debug_and_maintain: 5 implementation: 4 prerequisites: 3 versatility: 7 …
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The Facade Design Pattern Use the Facade pattern when you want to provide a simplified interface to a complex subsystem. This pattern makes the subsystem easier to understand, use, and test. The Facade pattern provides a unified interface to a set of interfaces in a subsystem, simplifying access to its functionality. Type: Structural Time Complexity: …
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The Command Design Pattern Use the Command pattern when you want to decouple the sender and receiver of a request, or when you want to parameterize objects with operations. The Command pattern encapsulates a request as an object, thereby allowing for parameterization of clients with different requests. Type: Behavioral Time Complexity: O(1) Efficiency: 6 Learning …
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The Composite Design Pattern Use the Composite pattern when you want to treat both individual objects and composites of objects uniformly. This pattern is useful for representing part-whole hierarchies. The Composite pattern composes objects into tree structures to represent part-whole hierarchies. Type: Structural Time Complexity: O(n) Efficiency: 6 Learning Difficulty: average 4.8 conceptual: 5 debug_and_maintain: …
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The Chain of Responsibility Design Pattern Use the Chain of Responsibility pattern when you want to pass a request along a chain of handlers and allow any of them to process the request. The Chain of Responsibility pattern decouples sender and receiver by giving more than one object a chance to handle a request. Type: …
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The Bridge Design Pattern Use the Bridge pattern when you want to separate an object’s abstraction from its implementation, allowing both to evolve independently without affecting each other. The Bridge pattern decouples an abstraction from its implementation so that the two can vary independently. Type: Structural Time Complexity: O(1) Efficiency: 7 Learning Difficulty: average 6.2 …
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