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An Introduction to Programming in Go

Type Aliasing

Explore how to define methods on types you don't own in Go by using type aliasing. Understand that aliasing creates a new name for an existing type without introducing a new type or altering the original meaning.

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To define methods on a type you don’t “own”, you need to define an alias​ for the type you want to extend.

Example

Go (1.6.2)
package main
import (
	"fmt"
	"strings"
)
type MyStr string //using MyStr as an alias for type string
func (s MyStr) Uppercase() string {
	return strings.ToUpper(string(s))
}
func main() {
	fmt.Println(MyStr("test").Uppercase())
}

Down below is another example ...