strategy_1.rb

class Runner
  attr_reader :name, :strategy
  attr_writer :strategy
  
  def initialize(name, strategy)
    @name = name
    @strategy = strategy
  end

  def run
    case @strategy
    when :jog
      puts "#{@name} is now jogging at a comfortable pace."
    when :sprint
      puts "#{@name} is now sprinting full speeed!"
    when :marathon
      puts "#{@name} is now running at a steady pace."
    else
      puts "#{@name} is now running."
    end
  end
end

class Race
  attr_reader :runners

  def initialize(runners)
    @runners = runners
  end

  def start
    @runners.each { |runner| runner.run }
  end
end

alice_ruby = Runner.new("Alice Ruby", :jog)
florence_joyner = Runner.new("Florence Joyner", :sprint)
eliud_kipchoge = Runner.new("Eliud Kipchoge", :marathon)

race = Race.new([alice_ruby, florence_joyner, eliud_kipchoge])
race.start
  # Alice Ruby is now jogging at a comfortable pace.
  # Florence Joyner is now sprinting full speeed!
  # Eliud Kipchoge is now running at a steady pace.