Na_Zajęciach_2

def array_diff(a, b)

  puts (a-b).inspect
end

def tree(height)
  (0...height).each do |floor|
    (1..height - floor).each do
      print ' '
    end
  zmienna = 1+floor*2
    (1..zmienna).each do
      print '*'
    end

    puts
  end

  (0...height).each do
    print ' '
  end
  puts '*'
end

def reverse_alternate(string)
  reversed = string.split(' ')
  (1...reversed.length).step(2).each do |index|
    reversed[index] = reversed[index].reverse
  end
   puts reversed.join(' ')
end

reverse_alternate('I really hope it works this time...')

tree(9)

array_diff([1, 2, 2, 3, 3, 4, 5], [1, 3, 5])