## The challenge#

Given a month as an integer from 1 to 12, return to which quarter of the year it belongs as an integer number.

For example: month 2 (February), is part of the first quarter; month 6 (June), is part of the second quarter; and month 11 (November), is part of the fourth quarter.

## The solution in Golang#

Option 1:

``````package solution

func QuarterOf(month int) int {
return (month + 2) / 3
}
``````

Option 2:

``````package solution

import("math")

func QuarterOf(month int) int {
quarter := math.Ceil(float64(month)/3)
return int(quarter)
}
``````

Option 3:

``````package solution

func QuarterOf(month int) int {
q := [12]int{1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4}
return q[month-1]
}
``````

## Test cases to validate our solution#

``````package our_test

import (
"time"
"math"
"math/rand"

. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)

var _ = Describe("Test Example", func() {
It("should test all values", func() {
for i := 1; i < 13; i++ {
Expect(QuarterOf(i)).To(Equal(solution(i)))
}
})
It("should test random values", func() {
rand.Seed(time.Now().UnixNano())
for i := 1; i < 100; i++ {
n := rand.Intn(12)+1
Expect(QuarterOf(n)).To(Equal(solution(n)))
}
})
})

func solution(month int) int {
return int(math.Ceil(float64(month) / 3))
}
``````