What does golang enumeration mean?

An enumeration is a data type that marks multiple named values, making the code clearer and easier to understand, avoiding hard coding, and helping to understand the options used in the project. There is no official enumeration type in the Go language , but enumerations can be implemented through constant simulation.

Operating system for this tutorial: Windows 10 system, Go1.20.1 version, Dell G3 computer.

Go language does not have an official enumeration type (Enumeration), but enumeration can be simulated through constants (Constatnts). You can use constant groups to define a group of related constants that have a common type and name.

An enumeration is a data type that marks multiple named values. It makes the code clearer and easier to understand, avoids hard coding, and helps understand the options used in the project.

In the Go language, it is generally recommended to use constants instead of enumerations, because constants can be directly implanted into the program without runtime calculations.

The following is an example of simulating an enumeration type in Go language:

package main
import "fmt"
type Gender int    // 定义一个 Gender 枚举类型
const (
    Male Gender = iota   // 0
    Female             // 自动顺序递增
    Unknown            // 可以赋值成其他整型类型或者未赋值相当于auto-increment下一个int 
)
func main() {
    fmt.Println(Male, Female, Unknown)  // 输出: 0 1 2
}

In this example, Gender is a custom type, which is internally based on the int type. Then three Gender type variables are defined in const, corresponding to three different gender options. These three variables will be internally mapped to int values ​​0, 1, and 2 respectively.

The above is the detailed content of What does golang enumeration mean?. For more information, please follow other related articles on the PHP Chinese website!