Golang Greatest Common Denomenator

main.go

package main

import (
	"fmt"
)

func greatestCommonDenomenator(x []int) int {
	gcd := func(a, b int) int {
		for b != 0 {
			t := b
			b = a % b
			a = t
		}
		return a
	}
	r := gcd(x[0], x[1])
	if len(x) > 3 {
		for i := 2; i < len(x); i++ {
			r = gcd(r, x[i])
		}
	}
	return r
}

func main() {
	fmt.Println(greatestCommonDenomenator([]int{40, 55, 60}))
}