How to Convert Between Go Structs with Embedded Structures?

Conversion Between Go Structs

In Go, structs offer a convenient way to organize and represent data. However, converting between structs of different types can sometimes be necessary. Consider the following scenario:

You have two structs, A and B, where A contains only a few essential fields, while B holds additional fields and inherits all fields from A. You want to convert a variable of type A into type B without manually copying the values.

Solution

Go provides a straightforward way to achieve this type of conversion:

<code class="go">package main

type A struct {
    a int
    b string
}

type B struct {
    A
    c string
    // Additional fields
}

func main() {
    // Create a variable of type A
    structA := A{a: 42, b: "foo"}

    // Convert structA to type B using embedded struct
    structB := B{A: structA}
}</code>

In this example, the B struct embeds an instance of A using its anonymous field. When converting structA to structB, the fields of structA are automatically assigned to the corresponding fields in structB, including the c field that was not present in A. This allows you to construct a complete B structure from an existing A variable effortlessly.

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