singleton_examples.rb

james = "say it loud!"
 
#1
def james.more
  puts "#{self} I'm black and proud!"
end
 
#2
class << james
  def power
    puts "#{self} Power to the people!"
  end
end
 
#3
singleton = class << james
  def soul
    puts "#{self} I'm the man with the plan"
  end
  self # singleton class object
end
 
puts (singleton.instance_methods - "james".methods) # more, power, soul
 
puts james # say it loud!
puts james.more  # say it loud! I'm black and proud!
puts james.power # say it loud! Power to the people
puts james.soul  # say it loud! I'm the man with the plan