How to Initialize Embedded Structs in Go?

Understanding Embedded Struct Initialization in Go

Go provides the concept of embedding, allowing a struct to contain fields from another type without duplicating its implementation. In the context of embedded structs, initializing the anonymous inner struct becomes an essential task.

Initializing Anonymous Inner Struct in MyRequest

Consider the following code snippet, where the MyRequest struct embeds the http.Request struct:

type MyRequest struct {
    http.Request
    PathParams map[string]string
}

To initialize the anonymous inner struct, http.Request, in the New function, you can follow these approaches:

• Using new keyword:

req := new(MyRequest)
req.PathParams = pathParams
req.Request = origRequest

• Using struct literal syntax:

req := &MyRequest{
  PathParams: pathParams
  Request: origRequest
}

Both approaches achieve the same goal of initializing the http.Request field of the MyRequest struct with the provided origRequest parameter.

Reference

For a deeper understanding of embedding and field naming in structs, refer to the official Go documentation:

• https://golang.org/ref/spec#Struct_types

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