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broguinn/raindrops.rb

Created August 30, 2013 00:58
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raindrops
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raindrops.rb
def raindrops(number)
raise TypeError.new "the number must be an integer" if !(number.is_a?(Integer))
phrase = ""
phrase << "Pling" if number % 3 == 0
phrase << "Plang" if number % 5 == 0
phrase << "Plong" if number % 7 == 0
(phrase == "") ? number.to_s : phrase
end
Raw
raindrops_spec.rb
require 'rspec'
require 'raindrops'
describe 'raindrops' do
it 'raises exceptions for non-integers' do
expect { raindrops(3.5) }.to raise_exception
expect { raindrops("foo") }.to raise_exception
expect { raindrops([14]) }.to raise_exception
end
it 'returns \'pling\' for numbers that have 3 as a prime factor' do
raindrops(6).should eq 'Pling'
end
it 'returns \'plang\' for numbers that have 5 as a prime factor' do
raindrops(25).should eq 'Plang'
end
it 'returns \'plong\' for numbers that have 7 as a prime factor' do
raindrops(14).should eq 'Plong'
end
it 'returns multiple phrases for multiple factors' do
raindrops(1755).should eq 'PlingPlang'
raindrops(105).should eq 'PlingPlangPlong'
end
it 'returns the original number in a string if 3, 5, or 7 are not prime factors' do
raindrops(34).should eq '34'
end
end
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