How to create a wrapper type using embedding in Go?

In Go, you can create a wrapper type using embedding. Embedding allows you to include one struct inside another, making it possible to extend or modify the behavior of the embedded struct. Here's an example of how you can create a wrapper type using embedding:

package main

import "fmt"

// Define the original struct that needs to be wrapped
type OriginalStruct struct {
	Field1 string
	Field2 int
}

// Create the wrapper struct that embeds OriginalStruct
type WrapperStruct struct {
	OriginalStruct
	AdditionalField string
}

// Define a method for the wrapper struct
func (w WrapperStruct) PrintFields() {
	fmt.Println("OriginalStruct.Field1:", w.Field1)
	fmt.Println("OriginalStruct.Field2:", w.Field2)
	fmt.Println("AdditionalField:", w.AdditionalField)
}

func main() {
	// Create an instance of the wrapper struct
	wrapper := WrapperStruct{
		OriginalStruct: OriginalStruct{
			Field1: "Hello",
			Field2: 42,
		},
		AdditionalField: "World",
	}

	// Use the method defined in the wrapper struct
	wrapper.PrintFields()
}

In the example above, OriginalStruct is the struct you want to wrap. WrapperStruct is created with an embedded OriginalStruct and an additional field called AdditionalField. The PrintFields method is defined for the WrapperStruct to print all the fields, including the ones from OriginalStruct.

By creating the wrapper type, you can extend the functionality of the original struct or modify its behavior. In this case, the ability to add an AdditionalField to the OriginalStruct.