Tour of Go 2.0

Range continued

Don’t need both the index and value? Use _ to discard whichever one you don’t want.

for i, _ := range pow
for _, value := range pow

If you only want the index, drop the second variable entirely:

for i := range pow

Try it: Change the first loop to use _ for the index and print only the computed values.

main.go ▶ Run in Playground 
package main

import "fmt"

func main() {
	pow := make([]int, 10)
	for i := range pow {
		pow[i] = 1 << uint(i) // == 2**i
	}
	for _, value := range pow {
		fmt.Printf("%d\n", value)
	}
}