Instantiate an abstract Golang struct dynamically with parameters

dynamic_obj_creation.go

package main

// Author: Srdjan Grubor
// License: Apache-2.0

import (
	"fmt"
)

// Interface common for all classes
type MainInterface interface {
	GetId() string
}

// First type of object
type FirstType struct {
	Id string
}

func (ft *FirstType) GetId() string {
	return ft.Id
}

// FirstType factory
func InitializeFirstType(id string) MainInterface {
	return &FirstType{Id: id}
}


// Second type of object
type SecondType struct {
	Id string
}

func (st *SecondType) GetId() string {
	return st.Id
}

// SecondType factory
func InitializeSecondType(id string) MainInterface {
	return &SecondType{Id: id}
}


func main() {
	// Map of strings to factories
	classes := map[string]func(string) MainInterface{
		"first": InitializeFirstType,
		"second": InitializeSecondType,
	}

	// Create a new FirstType object with value of 10 using the factory
	newObject := classes["first"]("10")

	// Show that we have the object correctly created
	fmt.Printf("%v\n", newObject.GetId())


	// Create a new SecondType object with value of 20 using the factory
	newObject2 := classes["second"]("20")

	// Show that we have the object correctly created
	fmt.Printf("%v\n", newObject2.GetId())
}