Programming Ruby 3.3

Comparable

If you want to be able to compare two objects of the same class in general, all you need to do is implement the <=> operator and include the Comparable module:

built_in_data/team.rb

class Team
  include Comparable
  attr_accessor :wins, :losses, :name

  def initialize(name, wins, losses)
    @name = name
    @wins = wins
    @losses = losses
  end

  def percentage = (wins * 1.0) / (wins + losses)

  def <=>(other)
    raise ArgumentError unless other.is_a?(Team)
    percentage <=> other.percentage
  end

  def to_s = name
end

brewers = Team.new("Brewers", 73, 89)
cardinals = Team.new("Cardinals", 86, 76)
cubs = Team.new("Cubs", 103, 58)
pirates = Team.new("Pirates", 78, 83) ...