Why is there no enumeration in golang?

In high-level languages ​​such as c# and java, enumeration types are often used to represent states, etc.

There is no enumeration type in golang. You can use const to simulate the enumeration type.                                                                                                                                                                                             (Recommended learning: go)

Enumeration can create a new type of variable based on any data type among Integer, Long, Short or Byte. Such variables can be set to one of a defined set, effectively preventing users from providing invalid values. This variable makes the code clearer because it describes a specific value.

type PolicyType int32const (
    Policy_MIN      PolicyType = 0
    Policy_MAX      PolicyType = 1
    Policy_MID      PolicyType = 2
    Policy_AVG      PolicyType = 3)
}

A new type PolicyType is defined here, and four constants (Policy_MIN, Policy_MAX, Policy_MID, Policy_AVG) are defined. The type is PolicyType.

Usage examples

func foo(p PolicyType) {
    fmt.Printf("enum value: %v\n", p)}func main() {
    foo(Policy_MAX)}

Run results

$ go build && ./main
enum value: 1

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