exercism/ruby/raindrops

Raindrops

Convert a number to a string, the contents of which depend on the number's factors.

• If the number has 3 as a factor, output 'Pling'.
• If the number has 5 as a factor, output 'Plang'.
• If the number has 7 as a factor, output 'Plong'.
• If the number does not have 3, 5, or 7 as a factor, just pass the number's digits straight through.

Examples

• 28's factors are 1, 2, 4, 7, 14, 28.
  • In raindrop-speak, this would be a simple "Plong".
• 30's factors are 1, 2, 3, 5, 6, 10, 15, 30.
  • In raindrop-speak, this would be a "PlingPlang".
• 34 has four factors: 1, 2, 17, and 34.
  • In raindrop-speak, this would be "34".

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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:

ruby raindrops_test.rb

To include color from the command line:

ruby -r minitest/pride raindrops_test.rb

Source

A variation on a famous interview question intended to weed out potential candidates. http://jumpstartlab.com

Submitting Incomplete Solutions

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