Go language: _ symbol

Unused variables in Go leads to compilation errors. You can get rid of the problem using _ symbol.

App.go

package main

import "fmt"

func main() {

 var vowels = []string{"a", "e", "i", "o", "u"}

 for i, v := range vowels {
  fmt.Printf("value %v\n", v)
 }

}

When you try to run above program, you will end up in below error.

# command-line-arguments
./App.go:9:6: i declared and not used

You can use _, to save you from unused variables.

for _, v := range vowels {

         fmt.Printf("value %v\n", v)

}

App.go

package main

import "fmt"

func main() {

 var vowels = []string{"a", "e", "i", "o", "u"}

 for _, v := range vowels {
  fmt.Printf("value %v\n", v)
 }

}

Output

value a

value e

value i

value o

value u

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