How to create fields in golang

In Golang, fields refer to variables in the structure. A structure is a custom type that can contain multiple different variables and constants, called fields. In Golang, structure fields can be easily created and initialized by using structure types and literal syntax.

1. Create a structure type

In Golang, you need to first define a structure type to store data. The following is the definition of an example structure type:

type Person struct {
    name string
    age  int
}

In the above code, a structure type named Person is defined, and two fields are defined in it: name and age. The name field is a string type used to store a person's name; the age field is an integer type used to store a person's age.

2. Create a structure instance

Once a structure type is defined, you can use that type to create a structure instance. Structure instances can initialize fields using literal syntax. The following is a sample code for creating a Person structure instance:

p := Person {
    name: "张三",
    age:  25,
}

In the above code, a Person structure instance named p is created and two fields are initialized using literal value syntax: name setting For "Zhang San", age is set to 25.

3. Accessing structure fields

Once a structure instance is created and the fields are initialized, you can access the fields. In Golang, you can use dot notation syntax to access structure fields. The following is a sample code for accessing fields in a Person structure instance:

fmt.Println(p.name) // 输出："张三"
fmt.Println(p.age)  // 输出：25

In the above code, the two fields name and age in the p structure instance are accessed using dot syntax and printed. to the console.

Summary:

In Golang, creating a structure field requires completing the following three steps:

1. Define a structure type, that is, define the data type of the field and name;
2. Use literal syntax to create a structure instance and initialize the values ​​of each field;
3. Use dot syntax to access each field in the structure instance.

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