How Can I Access Package Functions in Go Without Explicit Package Names?

Accessing Package Functions Without Explicit Package Names

In Go, it is generally considered good practice to refer to package functions using their qualified package names. However, there are some situations where you may want to call package functions without using the package name.

Using the Explicit Period Import

One way to import a package without using its package name is to use the explicit period (.) import. This tells the compiler to import all exported identifiers declared in the package's package block into the importing file's block. These identifiers can then be accessed without a qualifier.

Example:

<code class="go">package main

import (
    . "fmt"
)

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

Note: The use of the explicit period import is discouraged in the Go community as it makes programs more difficult to read. It is unclear if a name is a package-level identifier in the current package or in an imported package.

Using Package-Level Variables and Type Aliases

Another option is to declare a package-level variable with a reference to the function. You can also use a type alias to reference types.

Example:

<code class="go">package main

import (
    "fmt"
)

var Println = fmt.Println

type ScanState = fmt.ScanState // type alias

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

This approach allows you to use the identifier without the package name, but it introduces additional syntax and can be more verbose.

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