https://forum.golangbridge.org/t/create-a-factory-of-structs-with-reflect/2868/9

factory_pattern_example.go

package main

import (
	"fmt"
)

type Base interface {
	SetParams(string)
	GetParams() string
}

type Object1 struct {
	A string
}
type Object2 struct {
	A string
}
type Object3 struct {
	A string
}

func (o *Object1) SetParams(params string) {
	o.A = params
}
func (o *Object2) SetParams(params string) {
	o.A = params
}
func (o *Object3) SetParams(params string) {
	o.A = params
}

func (o *Object1) GetParams() string {
	return o.A
}
func (o *Object2) GetParams() string {
	return o.A
}
func (o *Object3) GetParams() string {
	return o.A
}

func GetStructByName(name string) Base {
	switch name {
	case "one":
		return &Object1{}
	case "two":
		return &Object2{}
	case "three":
		return &Object3{}
	}
	return nil
}

func main() {
	obj1 := GetStructByName("one")
	obj1.SetParams("klka")
	fmt.Println(obj1.GetParams())

	obj2 := GetStructByName("two")
	fmt.Println(obj2)

	obj3 := GetStructByName("three")
	fmt.Println(obj3)
}