def select_even_numbers(numbers)
  even_numbers = []
  numbers.each do |number|
    even_numbers << number if (number % 2 == 0)
  end
  even_numbers
end

print select_even_numbers([10, 4, 55, 36, 87, 43, 90, 8])
=> [10, 4, 36, 90, 8]