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thatrubylove/6.rb

Last active December 29, 2015 07:29
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Solution for problem #6 @ http://projecteuler.net/problem=6
Raw
6.rb
sum = ->(num_list) { num_list.reduce(:+) }
square = ->(number ) { number * number }
squares = ->(num_list) { num_list.map {|num| square.(num) } }
sum_squares = ->(num_list) { sum.(squares.(num_list)) }
square_sum = ->(num_list) { square.(sum.(num_list)) }
gem 'minitest'
require 'minitest/autorun'
describe "sum_squares" do
it { assert_equal 385, sum_squares.(1..10) }
end
describe "square_sum" do
it { assert_equal 3025, square_sum.(1..10) }
end
describe "answer to the solution" do
it { assert_equal 25164150, square_sum.(1..100) - sum_squares.(1..100) }
end
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