fold left on go

fold.go

package main

import (
	"./money"
	"fmt"
)

func main() {
	mon := make([]money.Money, 0, 10)

	mon = append(mon, money.NewSen())
	mon = append(mon, money.NewGosen())
	mon = append(mon, money.NewSen())
	mon = append(mon, money.NewSen())
	mon = append(mon, money.NewSen())
	mon = append(mon, money.NewSen())

	sum := foldl(mon, money.NewZero(), func(m1 money.Money, m2 money.Money) money.Money {
		result := m1.Add(m2)
		return result
	})

	fmt.Print("sum: ", sum.Price())
}

func foldl(ls []money.Money, z money.Money, op func(money.Money, money.Money) money.Money) money.Money {
	if len(ls) == 0 {
		return z
	} else {
		return foldl(ls[1:], op(z, ls[0]), op)
	}
}