How can I call a package function in Go without using the package prefix?

Invoking a Package Function Without Package Prefix

In Go, importing a package effectively copies its exported identifiers into the importing package's scope. However, there are cases where one may desire to access package functions without using their package name as a prefix. This question explores different methods to achieve this.

One approach is the "dot import" technique. The Go specification states that using a period (.) without a package name imports all exported identifiers from that package into the current package's file scope. This allows direct access to the imported functions without a prefix.

<code class="go">package main

import . "fmt" // import all exported identifiers from "fmt"

func main() {
    Println("hey there")
}</code>

However, this technique is discouraged in the Go community as it can make code more difficult to read by obscuring the source of an identifier.

Alternatively, one can declare a package-level variable referencing the desired function. This approach involves importing the package and declaring a variable that holds a reference to the function.

<code class="go">package main

import (
    "fmt"
)

var Println = fmt.Println // declare a package-level variable referencing fmt.Println

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

Lastly, type aliasing can be used to refer to types declared in imported packages.

<code class="go">package main

import (
    "fmt"
)

type ScanState = fmt.ScanState // type alias fmt.ScanState

func main() {
    // use ScanState as a type without the "fmt." prefix
}</code>

While these methods provide ways to avoid prefixing package names when invoking functions, it is important to note that the Go community generally encourages explicit naming and avoiding the dot import.

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