Blank identifier (underscore)

The blank identifier _ is an anonymous placeholder. It may be used like any other identifier in a declaration, but it does not introduce a binding.

Ignore values

The blank identifier provides a way to ignore left-hand side values in an assignment.

_, present := timeZone["CET"] sum := 0 for _, n := range a {	sum += n } 

Import for side effects

It can also be used to import a package solely for its side effects.

import _ "image/png" // init png decoder function

Silence the compiler

It can be used to during development to avoid compiler errors about unused imports and variables in a half-written program.

package main import (	"fmt"	"log"	"os" ) var _ = fmt.Printf // DEBUG: delete when done func main() {	f, err := os.Open("test.go")	if err != nil {	log.Fatal(err)	}	_ = f // TODO: read file }

For an automatic solution, use the goimports tool, which rewrites a Go source file to have the correct imports. Many Go editors and IDEs run this tool automatically.