10 Creational Design Patterns That May Change Your Perspective
The creational design pattern is a design pattern that deals with object creation mechanisms, trying to create objects in a manner suitable to the situation. These design patterns are built around a single, core principle: the abstraction of the process of object creation. The Creational Design Patterns are divided into two main categories: class-creational patterns and object-creational patterns.
Examples of Creational Design Patterns include the Singleton, Factory Method, Abstract Factory, Builder and Prototype.
I tried to explain them as best I could. Here is the list that includes 10 design patterns that I explained. You can check out which you want to learn and use it on your projects.
1. Abstract Factory Design Pattern
The Abstract Factory design pattern is a creational design pattern that provides an interface for creating families of related or dependent objects without specifying their concrete classes.
The Abstract Factory pattern separates the creation of products from their usage, and allows you to create families of related products without specifying their concrete classes. It provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes.
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2. Builder Design Pattern
The Builder design pattern is a creational design pattern that allows for the step-by-step creation of complex objects using a Builder object. Rather than creating the objects directly, the client code calls a series of methods on the Builder object to create the object. This allows for greater flexibility in the creation of objects, as the same client code can be used to create objects with different implementations.
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3. Dependency Injection Design Pattern
Dependency injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself. This helps to reduce the tight coupling between classes, making it easier to change the implementation of a dependency without affecting the class that uses it.
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4. Factory Method Design Pattern
The factory method design pattern is a creational design pattern that defines an interface for creating objects in a super class, but allows subclasses to alter the type of objects that will be created.
The factory method design pattern is used to define a method that creates objects, but lets subclasses decide which class to instantiate. The factory method design pattern lets a class defer instantiation to subclasses.
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5. Lazy Initialization Design Pattern
The lazy initialization design pattern is a design pattern in which an object is created only when it is needed. This can be useful for objects that are expensive to create or that are not used frequently, as it can save resources and improve performance.
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6. Multiton Design Pattern
The multiton pattern is a variation of the singleton pattern that allows a single class to have multiple instances, with each instance having a unique identifier. It is useful in cases where a singleton would be too limiting, but the number of instances is still limited and known ahead of time.
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7. Object Pool Design Pattern
In software engineering, the object pool design pattern is a software creational design pattern that uses a set of initialized objects kept ready to use — a “pool” — rather than creating new objects on demand. A client of the pool will request an object from the pool and perform operations on the returned object. When the client has finished, it returns the object to the pool rather than destroying it; this can be more efficient than destroying and recreating objects. The object pool pattern can offer a significant performance boost in situations where the cost of initializing a class instance is high, the rate of instantiation of a class is high, and the number of instantiations in use at any one time is low.
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8. Prototype Design Pattern
The prototype design pattern is a creational design pattern that allows an object to be created by copying an existing object, rather than creating a new instance from scratch. The existing object, known as the prototype, serves as a template for creating new objects. This can be useful in situations where creating a new instance from scratch is expensive or time-consuming, or where the desired object is not easily instantiated using standard constructors. The prototype pattern is often used in combination with other design patterns, such as the factory pattern, to provide a more flexible and efficient way of creating objects.
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9. RAII Design Pattern
We will talk about the C# side in a bit. But first let me start with C++.
RAII (Resource Acquisition Is Initialization) is a design pattern used in C++ to manage resources. The basic idea behind RAII is to tie the lifetime of a resource, such as a memory allocation or file handle, to the lifetime of an object. When the object is created, the resource is acquired, and when the object is destroyed, the resource is released. This ensures that the resource is always properly acquired and released, regardless of whether an exception is thrown or not, by using the concept of scope.
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10. Singleton Design Pattern
The Singleton design pattern is a way to ensure that a class has only one instance throughout the lifetime of an application, and to provide a global point of access to this instance. The key idea behind the pattern is to use a private constructor to prevent other classes from instantiating the class, and to use a static method to return the single instance of the class, creating the instance if it doesn’t already exist.
Also for a complete list you can check out my Creational Design Pattern list.
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