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require 'spec_helper'
require 'prime'
describe "problem ten" do
#The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
#Find the sum of all the primes below two million.
class SumOfPrime
attr_reader :limit
def initialize(limit)
@limit = limit
end
def sum
each.reduce(:+)
end
def each
Prime.each(limit)
#Enumerator.new do |yielder|
#2.upto(limit) do |n|
#yielder.yield(n) if prime?(n)
#end
#end
end
private
def prime?(number)
(2...number).each do |n|
return false if number % n == 0
end
true
end
end
it 'returns the sum of the primes below 10' do
expect(SumOfPrime.new(10).sum).to eql(17)
end
it 'returns thesum of the primes below 2_000_000' do
expect(SumOfPrime.new(2_000_000).sum).to eql(142_913_828_922)
end
end
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