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require "spec_helper"
def sum_of_all_multiples_under(number)
matches = -> (n) { n % 3 == 0 || n % 5 == 0 }
(0...number).inject(0) do |sum, next_number|
matches.call(next_number) ? sum + next_number : sum
end
end
describe "problem 1" do
it "finds the sum of all multiples of 3 or 5 below 10" do
result = sum_of_all_multiples_under(10)
expect(result).to eq(23)
end
it "finds the sum of all multiples of 3 or 5 below 1000" do
result = sum_of_all_multiples_under(1000)
expect(result).to eq(233_168)
end
end
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