4. Go Constants

Constants are values that cannot be changed.

How constants are defined in the Go language: const A = "admin"

A is a constant, but in fact the "admin" behind it is also a string constant.

The value of constant a cannot be changed at this time, and if you continue to assign a value, go will error: cannot assign to a

Also, the value of a constant must be determined at compile time and cannot be computed at the time the program runs. For example:

package main 

import (
	"fmt"
)

func main() {
    a := 10
    const b = a * 3

    fmt.Println("b =", b);
}

Go will error: const initializer A * 3 is not a constant

4. Go Constants