Conspicuously missing is the brilliant new Proc.curry method! For those that don't know currying is a method that returns another Proc with one fewer argument,

Conspicuously missing is the brilliant new Proc.curry method! For those that don't know currying is a method that returns another Proc with one fewer argument, so you can do: multiply = Proc.new { |x, y| x * y } multiply_by_five = multiply.curry(5) multiply_by_five.call(3) # => 15