Given an age in seconds, calculate how old someone would be on:
So if you were told someone were 1,000,000,000 seconds old, you should be able to say that they're 31.69 Earth-years old.
If you're wondering why Pluto didn't make the cut, go watch this youtube video.
Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=01
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
(ns space-age-test (:require [clojure.test :refer [deftest is]] space-age)) (defn- rounds-to [expected actual] (is (= (Math/round (* 100.0 expected)) (Math/round (* 100.0 actual))))) (deftest age-in-earth-years (rounds-to 31.69 (space-age/on-earth 1000000000))) (deftest age-in-mercury-years (let [seconds 2134835688] (rounds-to 67.65 (space-age/on-earth seconds)) (rounds-to 280.88 (space-age/on-mercury seconds)))) (deftest age-in-venus-years (let [seconds 189839836] (rounds-to 6.02 (space-age/on-earth seconds)) (rounds-to 9.78 (space-age/on-venus seconds)))) (deftest age-on-mars (let [seconds 2329871239] (rounds-to 73.83 (space-age/on-earth seconds)) (rounds-to 39.25 (space-age/on-mars seconds)))) (deftest age-on-jupiter (let [seconds 901876382] (rounds-to 28.58 (space-age/on-earth seconds)) (rounds-to 2.41 (space-age/on-jupiter seconds)))) (deftest age-on-saturn (let [seconds 3000000000] (rounds-to 95.06 (space-age/on-earth seconds)) (rounds-to 3.23 (space-age/on-saturn seconds)))) (deftest age-on-uranus (let [seconds 3210123456] (rounds-to 101.72 (space-age/on-earth seconds)) (rounds-to 1.21 (space-age/on-uranus seconds)))) (deftest age-on-neptune (let [seconds 8210123456] (rounds-to 260.16 (space-age/on-earth seconds)) (rounds-to 1.58 (space-age/on-neptune seconds))))
(ns space-age) (defn- earth-seconds-to-years [sec] (/ sec 31557600)) (defn- on-planet [orbital-period-years sec] (/ (earth-seconds-to-years sec) orbital-period-years)) (def on-mercury (partial on-planet 0.2408467)) (def on-venus (partial on-planet 0.61519726)) (def on-earth earth-seconds-to-years) (def on-mars (partial on-planet 1.8808158)) (def on-jupiter (partial on-planet 11.862615)) (def on-saturn (partial on-planet 29.447498)) (def on-neptune (partial on-planet 164.79132)) (def on-uranus (partial on-planet 84.016846))
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.