How Can You Call Go Package Functions Without Using the Package Name?

Invoking Package Functions Without Package Qualifiers in Go

In Go, importing packages allows access to their exported functions and types within the importing package. However, one may encounter scenarios where calling functions without using the package name is desirable.

Explicit Period Import

The Go specification provides a solution through the explicit period (.) import:

<code class="go">package main

import . "fmt" // Import package without a name

func main() {
    Println("Hey there") // Invoke fmt.Println without qualifier
}</code>

While effective, the Go community generally discourages the use of explicit period imports, citing readability concerns.

Package-Level References

An alternative approach involves declaring package-level references using type aliases:

<code class="go">package main

import "fmt"

var Println = fmt.Println // Reference to fmt.Println as package-level variable

type ScanState = fmt.ScanState // Type alias for fmt.ScanState

func main() {
    Println("Hello, playground") // Invoke Println without qualifier
}</code>

This method allows for explicit control over which functions and types are exported from the imported package.

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