The challenge
Clock shows h hours, m minutes and s seconds after midnight.
Your task is to write a function that returns the time since midnight in milliseconds.
Example:
h = 0
m = 1
s = 1
result = 61000
Input constraints:
0 <= h <= 230 <= m <= 590 <= s <= 59
The solution in Golang
Option 1:
package solution
func Past(h, m, s int) int {
return (h*3600000 + m*60000 + s*1000)
}
Option 2:
package solution
func Past(h, m, s int) int {
return (h*60*60+m*60+s)*1000
}
Option 3:
package solution
import "time"
func Past(h, m, s int) (ms int) {
now := time.Unix(0, 0)
now = now.Add(time.Duration(h) * time.Hour)
now = now.Add(time.Duration(m) * time.Minute)
now = now.Add(time.Duration(s) * time.Second)
return int(now.Sub(time.Unix(0, 0)) / 1000000)
}
Test cases to validate our solution
package solution_test
import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Basic tests", func() {
It("Past(0, 1, 1)", func() { Expect(Past(0, 1, 1)).To(Equal(61000)) })
It("Past(1, 1, 1)", func() { Expect(Past(1, 1, 1)).To(Equal(3661000)) })
It("Past(0, 0, 0)", func() { Expect(Past(0, 0, 0)).To(Equal(0)) })
It("Past(1, 0, 1)", func() { Expect(Past(1, 0, 1)).To(Equal(3601000)) })
It("Past(1, 0, 0)", func() { Expect(Past(1, 0, 0)).To(Equal(3600000)) })
})
