Also, there's some application for lambdas, here: ruby-1.9.3-p0 :001 > double = -> x { x * 2 } => #<Proc:0x000001009236e0@(irb):1 (lambda)> ruby-1.9.3-

Also, there's some application for lambdas, here: ruby-1.9.3-p0 :001 > double = -> x { x * 2 } => #<Proc:0x000001009236e0@(irb):1 (lambda)> ruby-1.9.3-p0 :002 > double[2] => 4 ruby-1.9.3-p0 :003 > [1].map(&double) => [2]