How to Avoid Code Repetition for Functions with Shared Fields in Golang?

Avoiding Code Repetition for Functions with Shared Fields in Golang

To prevent code duplication when writing functions for multiple structs with identical fields, consider the following approach:

Instead of defining separate functions for each struct, create a custom type for the shared field, such as Version string. This type can act as a method receiver for the function you want to implement.

<code class="go">type Version string

func (v Version) PrintVersion() {
    fmt.Println("Version is", v)
}</code>

In your structs, include the custom type as a field using composition:

<code class="go">type Game struct {
    Name               string
    MultiplayerSupport bool
    Genre              string
    Version
}

type ERP struct {
    Name               string
    MRPSupport         bool
    SupportedDatabases []string
    Version
}</code>

Now, you can access and print the Version field from both structs using the method attached to the custom type:

<code class="go">func main() {

    g := Game{
        "Fear Effect",
        false,
        "Action-Adventure",
        "1.0.0",
    }

    g.PrintVersion()
    // Version is 1.0.0


    e := ERP{
        "Logo",
        true,
        []string{"ms-sql"},
        "2.0.0",
    }

    e.PrintVersion()
    // Version is 2.0.0

}</code>

This approach allows you to avoid code repetition while maintaining the ability to print the Version field from different structs. By defining the function as a method of a custom type, you ensure that the same implementation is used for all structs that embed that type.

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