Ruby cyclic rotation of array elements

cyclic_rotation.rb

class CyclicRotation
    def solution(array, num)
        new_array = Array.new(array.length)

        array.each_with_index do |element, idx|
            # (index + element) % array_size will give new index value to which we have to insert current value
            new_array[(idx + num) % array.length] = element
        end

        new_array
    end
end

puts CyclicRotation.new.solution([3, 8, 9, 7, 6], 3).join(',')
puts CyclicRotation.new.solution([1, 2, 3, 4], 1).join(',')