count.rb

# COUNT
# input : array
# output:  fixnum = number of element which match with condition

array = ['Michel Polnareff', 'Michel Jonasz', 'Michel Delpech', 'Maxime Leforestier']
counter = 0
array.each do |singer|
  if singer.split[1].downcase.include?("o")
    counter += 1
  end
end
puts counter

counter = array.count do |star|
  puts last_name = star.split.last
  last_name.downcase.include?("o")
end
puts counter