A builder design pattern or chaining in Golang.

Chaining.go

package main

import (
	"fmt"
)

type Calculator struct{
	total int	
}

func (calculate Calculator) add(num int) Calculator {
	calculate.total = calculate.total + num
	return calculate
}

func (calculate Calculator) remove(num int) Calculator {
	calculate.total = calculate.total - num
	return calculate
}

func (calculate Calculator) calc() int{
	return calculate.total
}


func main() {
	obj:= Calculator{total: 0}
	//obj.add(2).remove(1).calc()
	fmt.Println(obj.add(12).remove(1).calc())
}

A builder design pattern or chaining in Golang.