In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design. A design pattern isn't a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.
These design patterns are all about class instantiation. This pattern can be further divided into class-creation patterns and object-creational patterns. While class-creation patterns use inheritance effectively in the instantiation process, object-creation patterns use delegation effectively to get the job done.
Creates an instance of several families of classes
Separates object construction from its representation
Creates an instance of several derived classes
Avoid expensive acquisition and release of resources by recycling objects that are no longer in use
A fully initialized instance to be copied or cloned
A class of which only a single instance can exist
These design patterns are all about Class and Object composition. Structural class-creation patterns use inheritance to compose interfaces. Structural object-patterns define ways to compose objects to obtain new functionality.
Match interfaces of different classes
Separates an object's interface from its implementation
A tree structure of simple and composite objects
Add responsibilities to objects dynamically
A single class that represents an entire subsystem
A fine-grained instance used for efficient sharing
Restricts accessor/mutator access
An object representing another object
These design patterns are all about Class's objects communication. Behavioral patterns are those patterns that are most specifically concerned with communication between objects.
A way of passing a request between a chain of objects
Encapsulate a command request as an object
A way to include language elements in a program
Sequentially access the elements of a collection
Defines simplified communication between classes
Capture and restore an object's internal state
Designed to act as a default value of an object
A way of notifying change to a number of classes
Alter an object's behavior when its state changes
Encapsulates an algorithm inside a class
Defer the exact steps of an algorithm to a subclass
Defines a new operation to a class without change
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent