In Go, a constant list is declared using the const keyword and can contain a fixed sequence or array of constant values. Here is an example:
package main
import "fmt"
func main() {
const (
a = 1
b = 2
c = 3
)
fmt.Println(a, b, c) // Output: 1 2 3
}
In the above example, we have declared a constant list with 3 values a, b, and c, which are assigned the constant values 1, 2, and 3, respectively. These constants can be used within the program and their values cannot be changed throughout the program execution.
We can also declare a constant list with iota, which is a pre-declared identifier that can be used to generate a sequence of consecutive integer values. Here is an example:
package main
import "fmt"
const (
Monday = iota + 1
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
)
func main() {
fmt.Println("Days of the week:")
fmt.Println("Monday:", Monday)
fmt.Println("Tuesday:", Tuesday)
fmt.Println("Wednesday:", Wednesday)
fmt.Println("Thursday:", Thursday)
fmt.Println("Friday:", Friday)
fmt.Println("Saturday:", Saturday)
fmt.Println("Sunday:", Sunday)
}
In the above example, we have declared a constant list with 7 values representing the days of the week. We have used the iota identifier to generate a sequence of consecutive integer values, starting from 1, which are assigned to each constant. The output will be:
Days of the week:
Monday: 1
Tuesday: 2
Wednesday: 3
Thursday: 4
Friday: 5
Saturday: 6
Sunday: 7