Calculate the moment when someone has lived for 10^9 seconds.
A gigasecond is 10^9 (1,000,000,000) seconds.
For installation and learning resources, refer to the exercism help 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:
To include color from the command line:
ruby -r minitest/pride gigasecond_test.rb
Chapter 9 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=09
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
require 'minitest/autorun' require_relative 'gigasecond' # Common test data version: 1.0.0 61e7d70 class GigasecondTest < Minitest::Test def test_date_only_specification_of_time # skip assert_equal Time.utc(2043, 1, 1, 1, 46, 40), Gigasecond.from(Time.utc(2011, 4, 25, 0, 0, 0)) end def test_second_test_for_date_only_specification_of_time skip assert_equal Time.utc(2009, 2, 19, 1, 46, 40), Gigasecond.from(Time.utc(1977, 6, 13, 0, 0, 0)) end def test_third_test_for_date_only_specification_of_time skip assert_equal Time.utc(1991, 3, 27, 1, 46, 40), Gigasecond.from(Time.utc(1959, 7, 19, 0, 0, 0)) end def test_full_time_specified skip assert_equal Time.utc(2046, 10, 2, 23, 46, 40), Gigasecond.from(Time.utc(2015, 1, 24, 22, 0, 0)) end def test_full_time_with_day_roll_over skip assert_equal Time.utc(2046, 10, 3, 1, 46, 39), Gigasecond.from(Time.utc(2015, 1, 24, 23, 59, 59)) end # Problems in exercism evolve over time, as we find better ways to ask # questions. # The version number refers to the version of the problem you solved, # not your solution. # # Define a constant named VERSION inside of the top level BookKeeping # module, which may be placed near the end of your file. # # In your file, it will look like this: # # module BookKeeping # VERSION = 1 # Where the version number matches the one in the test. # end # # If you are curious, read more about constants on RubyDoc: # http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html def test_bookkeeping skip assert_equal 6, BookKeeping::VERSION end end
class Gigasecond DELTA = 10 ** 9 def self.from(time) Time.at(time.to_i + DELTA) end end module BookKeeping VERSION = 3 end
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.