gistfile1.rb

Array.class_eval do
  def to_proc
    first, *rest = self
    Proc.new{|o| o.send(first, *rest) }
  end
end

# p (1..10).map{|i|i.divmod(2)}
p (1..10).map(&[:divmod,2])

content = "Hello World"
File.open("/tmp/foobar.txt", "w", &[:puts, content])
puts File.read("/tmp/foobar.txt")