Just a function to format float64 to money in Golang :)

fmtMoney.go

package main

import (
	"fmt"
	"math"
	"strings"
)

func main() {
	var money float64 = 6922850.56
	fmt.Println(fmtMoney(money, 2))
	money = 0
	fmt.Println(fmtMoney(money, 2))
	money = 1
	fmt.Println(fmtMoney(money, 2))
	money = 18
	fmt.Println(fmtMoney(money, 4))
	money = 18.5641862
	fmt.Println(fmtMoney(money, 6))
	money = 123
	fmt.Println(fmtMoney(money, 0))
	money = -123
	fmt.Println(fmtMoney(money, 1))
	money = 123.75
	fmt.Println(fmtMoney(money, 2))
	money = 3123.75
	fmt.Println(fmtMoney(money, 2))
	money = -3123.75
	fmt.Println(fmtMoney(money, 6))
	money = 48621
	fmt.Println(fmtMoney(money, 2))
	money = -48621.99
	fmt.Println(fmtMoney(money, 4))
	money = 100000
	fmt.Println(fmtMoney(money, 2))
	money = 109850.346
	fmt.Println(fmtMoney(money, 2))
	money = 1098500
	fmt.Println(fmtMoney(money, 4))
	money = 999999999.99
	fmt.Println(fmtMoney(money, 2))
	money = 0
	fmt.Println(fmtMoney(money, 0))
}

func fmtMoney(v float64, d uint) string {
	var sign, decimals string
	if v < 0 {
		sign = "-"
		v = math.Abs(v)
	}
	places := fmt.Sprintf("%d", d)
	tmp := fmt.Sprintf("%."+places+"f", v)
	splited := strings.Split(tmp, ".")
	if len(splited) > 1 {
		decimals = splited[1]
	} else {
		decimals = ""
	}
	integers := splited[0]
	var retval string
	for i := len(integers); i > 0; i -= 3 {
		if i-3 <= 0 {
			retval = integers[0:i] + retval
			break
		}
		retval = "," + integers[i-3:i] + retval
	}
	retval = sign + retval
	if len(decimals) > 0 {
		retval += "." + decimals
	}
	return retval
}

https://play.golang.com/p/0TfWmTC2a7j