Detailed explanation of Golang's method structure

Golang is a rapidly developing programming language, and its method structure is becoming increasingly perfect. Therefore, this article will introduce the method structure of Golang in detail.

1. What is method?

Before talking about Golang’s method structure, we must first understand what a method is. A method is essentially an operation performed on a data structure. Its operation will change the state of the structure. In Golang, methods are functions defined on structures.

2. Golang’s method classification

In Golang, methods can be divided into three categories:

1. Value type methods

Value type The method works on value type data, such as int, float, string, etc. This method cannot change the data.

2. Pointer type methods

Pointer type methods operate on pointer type data, such as int, float, *string, etc. This method can change the data.

3. Methods of interface types

Methods of interface types are methods based on interface types and can receive any type that implements the interface, regardless of value type or pointer type.

3. Method declaration methods in Golang

In Golang, there are two ways to declare methods:

1. Value type methods

func (变量 变量类型) 方法名(参数列表) 返回值列表 {
    //方法体
}

2. Pointer type methods

func (变量 *变量类型) 方法名(参数列表) 返回值列表 {
    //方法体
}

Note that value types and pointer types cannot be mixed, as this will cause compilation errors. In general, if a method requires changing data, you should use a pointer type method.

4. Method calling in Golang

In Golang, the method calling method is:

变量.方法(参数列表)

Among them, the variable can be a value type variable or a pointer type variable.

5. Method overloading in Golang

In Golang, method overloading is prohibited. Simply put, method overloading is to define multiple methods with the same name in the same structure. In Golang, if multiple methods with the same name are defined in the same structure, the compiler will report an error.

6. Golang’s method search order

In Golang, when calling a method of a structure, the compiler will search in the following order:

1. Structure Methods defined in

2. Methods defined in the interface implemented by the structure

3. Methods defined in the parent class of the structure

If any of the above three conditions If there are duplicate method names, the compiler will select the first method found.

7. Precautions for Golang methods

1. Do not mix value types and pointer types.

2. Different method names in different structures will not affect each other.

3. In Golang, method calls are passed by value and the original value will not be changed. If you need to modify the original value, you must use pointer type methods.

4. If you want to change a pointer type variable, you must first create an instance of the variable and pass the address of the instance into the method as a pointer type variable.

8. Summary

This article mainly introduces the method structure of Golang, including method classification, declaration method, calling method, search order and precautions, etc. I hope this article can help everyone understand the method structure of Golang.

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