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@kkchu791
Last active May 16, 2019 18:14
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# 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".
* * * *
Solution:
module Raindrops
SOUNDS={ 3 => 'Pling',
5 => 'Plang',
7 => 'Plong'}
def self.convert(drop_count)
make_sounds(drop_count)
end
def self.make_sounds(drop_count)
total_sounds = SOUNDS.map do |num, sound|
sound if (drop_count % num).zero?
end.compact.join
total_sounds.empty? ? drop_count.to_s : total_sounds
end
end
* * * *
def test_the_sound_for_105_is_plingplangplong_as_it_has_factors_3_5_and_7
assert_equal "PlingPlangPlong", Raindrops.convert(105)
end
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