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qarlee's solution

to Space Age in the Raku Track

Published at Jan 19 2020 · 0 comments
Test suite


This exercise has changed since this solution was written.

Given an age in seconds, calculate how old someone would be on:

  • Mercury: orbital period 0.2408467 Earth years
  • Venus: orbital period 0.61519726 Earth years
  • Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31557600 seconds
  • Mars: orbital period 1.8808158 Earth years
  • Jupiter: orbital period 11.862615 Earth years
  • Saturn: orbital period 29.447498 Earth years
  • Uranus: orbital period 84.016846 Earth years
  • Neptune: orbital period 164.79132 Earth years

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.


Remember to check out the Raku documentation and resources pages for information, tips, and examples if you get stuck.

Running the tests

There is a test suite and module included with the exercise. The test suite (a file with the extension .t6) will attempt to run routines from the module (a file with the extension .pm6). Add/modify routines in the module so that the tests will pass! You can view the test data by executing the command perl6 --doc *.t6 (* being the name of the test suite), and run the test suite for the exercise by executing the command prove6 . in the exercise directory.


Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=01

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

unit module SpaceAge;

role Planet {
  has $.orbital-period;
  method age-on ($seconds) {
    ($seconds / $.orbital-period).round:  0.01;

class Earth does Planet is export {
  my $.orbital-period = 31557600;

class Mercury does Planet is export {
  my $.orbital-period = 31557600 * 0.2408467;

class Venus does Planet is export {
  my $.orbital-period = 31557600 * 0.61519726;

class Mars does Planet is export {
  my $.orbital-period = 31557600 * 1.8808158;

class Jupiter does Planet is export {
  my $.orbital-period = 31557600 * 11.862615;

class Saturn does Planet is export {
  my $.orbital-period = 31557600 * 29.447498;

class Uranus does Planet is export {
  my $.orbital-period = 31557600 * 84.016846;

class Neptune does Planet is export {
  my $.orbital-period = 31557600 * 164.79132;

=for comment
Orbital periods relative to Earth:
  Mercury: 0.2408467
  Venus: 0.61519726
  Mars: 1.8808158
  Jupiter: 11.862615
  Saturn: 29.447498
  Uranus: 84.016846
  Neptune: 164.79132

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