euler/euler028.rb

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Ruby
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def spiral(size)
max_value = size**2
diagonals = [1]
diagonal_increase_value = 2
current_num = 1
until current_num == max_value
4.times do
current_num += diagonal_increase_value
diagonals << current_num
end
diagonal_increase_value += 2
end
diagonals.inject(:+)
end