Overview

Go only supports four types of constant

• Numeric ( int, int64, float, float64, complex128 etc)
• String
• Character or rune
• Boolean

It doesn’t support const struct. So below program would raise a compilation error

Example

package main
import "fmt"
type employee struct {
    name string
    age  int
}
func main() {
    const e = employee{
        name: "John",
        age:  21,
    }
    fmt.Println(e)
}

Output

const initializer employee literal is not a constant

However workaround is to have a function which could return a struct. In a way that fulfills the purpose of a constant struct as it would return the same struct everytime

package main
import "fmt"
type employee struct {
    name string
    age  int
}
func main() {
    e := baseEmployee()
    fmt.Println(e)
}
func baseEmployee() employee {
    return employee{
        name: "Unnamed",
        age:  0,
    }
}

Output

{Unnamed 0}