Pregunta.rb

array = Array.new(10000) { rand(1...5000) }

def most_popular_number(array)
  a = array.uniq.map { |e| [e, array.count(e)] }.sort_by { |_, cnt| -cnt }
  elements = a.take_while { |_, cnt| cnt == a.first.last }.sort
  # Verify if the array is empty.
  if array.empty?
    puts 'MostPopularNumber array is empty!'
    # Verify if there's only one element.
  elsif array.size == 1
    puts "MostPopularNumber (#{array}, #{array.size}) --> #{a.first.first} // #{a.first.first} is the only number"
  elsif elements.count == 1
    puts "MostPopularNumber (#{array}, #{array.size}) --> #{a.first.first} // #{a.first.first} appears #{a.first.last} times"
  elsif elements.sort.count >= 2
    puts "MostPopularNumber (#{array}, #{array.size}) --> #{a.first.first} // #{a.first.first} < #{a[1].first}"
  end
end

most_popular_number(array)