Go practice -- factory mode of design patterns in golang (simple factory, factory method, abstract factory)

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continue ,golang Discussion on design pattern in .
According to international practice , After talking about the singleton mode , Then it's the factory mode . Or that sentence , Everyone has a different understanding of design patterns , Welcome to discuss .

What is the factory model

WIKI:
In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created.

Baidu Encyclopedia ：
Factory pattern is the most commonly used instantiation object pattern , It's a factory approach new A mode of operation .

In an object-oriented programming language （ Such as java,C++） The concept of design pattern is well known , It is also widely used . Design patterns make our code flexible ࿰