Shows that a derived class' initialize passes its args to super's initialize when super is called without any args.

super_example.rb

# Shows that a derived class' initialize passes its args to super's
# initialize when super is called without any args.

class Base
  
  attr_accessor :foo
  
  def initialize(foo='base')
    @foo = foo
  end

  def to_s
    "foo: #{foo}"
  end
end


class Derived < Base
  
  def initialize(foo = "derived")
    super  # invisibly passes foo to super's initialize
  end
  
end


puts Derived.new
# foo: derived

puts Derived.new("something else")
# foo: something else