How to Import All Exported Identifiers from a Go Package?

Importing the Full Contents of a Package

As mentioned in the Go Programming Language Specification, importing the full contents of a package is possible by using an explicit period (.) instead of a name in an import declaration. This imports all the exported identifiers declared in the package's package block, allowing you to access them without a qualifier.

For instance, consider the following code:

<code class="go">import "fmt"

func main() {
    fmt.Println("Hello, world")
}</code>

In this example, you must prefix calls to fmt with the package name. To import the full contents of the fmt package, you can use the following code:

<code class="go">import . "fmt"

func main() {
    Println("Hello, world")
}</code>

By importing the full contents of the package, you can access the exported identifiers directly, eliminating the need for the package name prefix.

Here's a breakdown of the revised code:

• package main defines the main package.
• import . "fmt" imports the full contents of the fmt package, allowing direct access to its exported identifiers.
• func main() defines the entry point for the program.
• Println("Hello, world") calls the exported Println function from the fmt package to print the specified message.

This modified code will compile successfully and produce the same output:

Hello, world

For additional clarity, here's an example from the Go Playground: https://play.golang.org/p/xl7DIxxMlU5

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