go composition / published by https://github.com/dacr/code-examples-manager #e191920d-73ab-4540-825e-2ecc4ca83488/c6c43932cad586b4c08aae8b849117ce4e6da489

composition.go

/*?sr/bin/true; exec /usr/bin/env nix-shell -p go --run "go run $0" #*/
// summary : go composition
// keywords : go, composition, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : e191920d-73ab-4540-825e-2ecc4ca83488
// created-on : 2025-03-27T15:11:42+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : nix-shell -p go --run "go run $file"
package main

type Animal struct {
	name string
}

type Cat struct {
	Animal
	meow string
}

type Dog struct {
	Animal
	bark string
}

func main() {
	catty := Cat{Animal{"Fluffy"}, "meow"}
	doggy := Dog{Animal{"Fido"}, "woof"}

	println(catty.meow, catty.Animal.name)

	//animals := []Animal{catty, doggy} // USE INTERFACE INSTEAD !!!
	animals := []Animal{catty.Animal, doggy.Animal}

	for _, animal := range animals {
		println(animal.name)
	}
}