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Go - Exports

An identifier may be exported to permit access to it from another package.

An identifier is exported only if:

  1. The first character of its name is an uppercase letter
  2. It is declared in the package block or it is a field name or method name
package example
// Identifiers that start with an uppercase letter are exported.
// They can be referred to when the package is imported.
var ExportedVariable int = 10
// This variables is not exported and cannot be referenced.
// Only accessible in the declaring package.
var localVariable string = "Hello World!"
// Exported function.
func Hello() string {
return localVariable

Using the exported identifiers:

package main
import (
func main() {
// Access an exported variable.
// Access an exported function.