Field Vs. Constructor Injection

fieldVsConstructorInjection.go

package main

import (
	"net/http"
)

type FieldInjection struct {
	foo http.Server
	bar http.Server
}

func NewFieldInjection() FieldInjection {
	return FieldInjection{
		foo: http.Server{},
		bar: http.Server{},
	}
}

// client using above struct
func client() {
	// client can't pass in their own server
	_ = NewFieldInjection()
}

type ConstructorInjection struct {
	Foo http.Server
	Bar http.Server
}

// client using above struct
func client() {
	// client can determine the dependencies.
	// ConstructorInjection is unopinionated.
	_ = ConstructorInjection{
		Foo: http.Server{},
		Bar: http.Server{},
	}
}