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How to use iota in Golang?
Iota in Go is used to represent constant increasing sequences. When repeated in a constant, its value gets incremented after each specification. In this article, we will explore the different ways in which we can use iota in Go.
Let's first consider a very basic example, where we will declare multiple constants and use iota.
Example 1
Consider the code shown below
package main
import (
"fmt"
)
const (
first = iota
second = iota
third = iota
)
func main() {
fmt.Println(first, second, third)
}Output
If we run the command go run main.go, then we will get the following output in the terminal.
0 1 2
We can also omit the repetition of the iota keyword in the above example. Consider the code shown below.
Example 2
package main
import (
"fmt"
)
const (
first = iota
second
third
)
func main() {
fmt.Println(first, second, third)
}Output
If we run the command go run main.go, then we will get the following output in the terminal.
0 1 2
It is not necessary to start the iota with the default value; we can start it with 1 also.
Example 3
Consider the code shown below
package main
import (
"fmt"
)
const (
first = iota + 1
second
third
)
func main() {
fmt.Println(first, second, third)
}Output
If we run the command go run main.go, then we will get the following output in the terminal.
1 2 3
We can also skip the values while using iota.
Example 4
Consider the code shown below.
package main
import (
"fmt"
)
const (
first = iota + 1
second
_
fourth
)
func main() {
fmt.Println(first, second, fourth)
}Output
If we run the command go run main.go, then we will get the following output in the terminal.
1 2 4
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