space_age.go

package space

import "math"

type Planet string

var orbitalPeriod = map[string]float64{
	"Mercury": 0.2408467,
	"Venus":   0.61519726,
	"Earth":   1.0,
	"Mars":    1.8808158,
	"Jupiter": 11.862615,
	"Saturn":  29.447498,
	"Uranus":  84.016846,
	"Neptune": 164.79132,
}

func Age(age float64, planet Planet) float64 {
	second := make(map[string]float64)

	for key, value := range orbitalPeriod {
		// value * (365*24*60*60)
		second[key] = value * 3.154e+7
	}

	age = age / second[string(planet)]
	return math.Round(age*100) / 100
}