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