How to Convert Between Go Structs with Different Fields?

Struct Conversion in Go

Q: I have two structs with different fields. How can I convert a variable of type A to type B, where A contains only essential fields and B contains additional fields? Is it possible to perform this conversion directly or do I need to manually copy fields?

A: In Go, struct conversion can be performed by leveraging the embedding feature. This allows you to nest the fields of one struct within another. For example, in your case, you have a struct A with two fields (a and b), and a struct B that embeds struct A and adds additional fields (c and potentially more).

To convert from A to B, you can simply create a B struct and embed an instance of A within it:

<code class="go">type A struct {
    a int
    b string
}

type B struct {
    A
    c string
}

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

    // convert to type B
    structB := B{A: structA}

    // access the fields of structB
    fmt.Println(structB.a, structB.b, structB.c) // Output: 42 foo (additional value)
}</code>

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