---
# System prepended metadata

title: Untitled

---

package main

import "fmt"

type A struct {
	id int
}

type Builder interface {
	add() A
	remove() A
}

func (a A) add(el int) A{
	a.id = el
	return a
}

func (a A) remove() A{
	a.id = 0
	return a
}




func main() {
	n := A{1}
	
	fmt.Println(n.add(2).remove())
}
