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.
For installation and learning resources, refer to the Ruby resources page.
For running the tests provided, you will need the Minitest gem. Open a terminal window and run the following command to install minitest:
gem install minitest
If you would like color output, you can require 'minitest/pride'
in
the test file, or note the alternative instruction, below, for running
the test file.
Run the tests from the exercise directory using the following command:
ruby space_age_test.rb
To include color from the command line:
ruby -r minitest/pride space_age_test.rb
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.
require 'minitest/autorun'
require_relative 'space_age'
# Common test data version: 1.1.0 8d4df79
class SpaceAgeTest < Minitest::Test
# assert_in_delta will pass if the difference
# between the values being compared is less
# than the allowed delta
DELTA = 0.01
def test_age_on_earth
# skip
age = SpaceAge.new(1_000_000_000)
assert_in_delta 31.69, age.on_earth, DELTA
end
def test_age_on_mercury
skip
age = SpaceAge.new(2_134_835_688)
assert_in_delta 280.88, age.on_mercury, DELTA
end
def test_age_on_venus
skip
age = SpaceAge.new(189_839_836)
assert_in_delta 9.78, age.on_venus, DELTA
end
def test_age_on_mars
skip
age = SpaceAge.new(2_329_871_239)
assert_in_delta 39.25, age.on_mars, DELTA
end
def test_age_on_jupiter
skip
age = SpaceAge.new(901_876_382)
assert_in_delta 2.41, age.on_jupiter, DELTA
end
def test_age_on_saturn
skip
age = SpaceAge.new(3_000_000_000)
assert_in_delta 3.23, age.on_saturn, DELTA
end
def test_age_on_uranus
skip
age = SpaceAge.new(3_210_123_456)
assert_in_delta 1.21, age.on_uranus, DELTA
end
def test_age_on_neptune
skip
age = SpaceAge.new(8_210_123_456)
assert_in_delta 1.58, age.on_neptune, DELTA
end
end
class SpaceAge
BASE_ORBITAL_PERIOD = 31_557_600
ORBITAL_PERIOD_RATIOS = {
earth: 1.0,
mercury: 0.2408467,
venus: 0.61519726,
mars: 1.8808158,
jupiter: 11.862615,
saturn: 29.447498,
uranus: 84.016846,
neptune: 164.79132
}.freeze
def initialize(seconds)
@seconds = seconds
end
ORBITAL_PERIOD_RATIOS.each do |planet, ratio|
define_method("on_#{planet}") do
planet_period = BASE_ORBITAL_PERIOD * ratio
@seconds / planet_period
end
end
end
module BookKeeping
VERSION = 1
end
Meta programming isn't super readable, but I thought this was a nice opportunity to do a bit of it. Let me know what you think and if you have suggestions on how to improve the looks of it! 😊
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