11. Constants
Can not change me
A
const declaration defines named values that look syntactically like variables but whose value is constant.Instead of the var keyword, we use the const keyword.A value must be assigned while declaring constants.Constants only exists during compile time!Constants are declared using
const keyword.main.go
const pi = 3.14
Similar to variable block, we can also have constant block.
main.go
const (
pi = 3.14
daysInWeek = 7
)
iota can be used to create enumerated constants. It is also called as constant generator.main.go
const (
Sunday int = iota
)
func main() {
fmt.Println(Sunday)
}
Benefits of using iota is that it will increment itself for next const declaration in same const block.
main.go
const (
Monday int = iota + 1
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
)
func main() {
fmt.Println(Monday, Tuesday, Wednesday, Thursday,
Friday, Saturday, Sunday)
}
// output : 1 2 3 4 5 6 7
Last modified 3yr ago