underscore.rb

p ["foo", "bar"].map(&:upcase) # nice
p ["foo", "bar"].map{ |s| s.sub(/[a-z]/, '') } # ugh

class Underscore < BasicObject
  def method_missing(name, *args)
    ::Kernel.lambda{ |a| a.public_send(name, *args) }
  end
end

UNDERSCORE = Underscore.new
def _; UNDERSCORE end

p ["foo", "bar"].map(&_.sub(/[a-z]/, '')) # nice