Reflection on method parameters in Ruby

Question

Take the following class:

class Automator
  def fill_specific_form(fields)
    fields.each_pair do |key, value|
      puts \"Setting \'#{key}\' to \'#{value}         


        

Answer 1

To reflect on a method's (or Proc's) parameters, you can use Proc#parameters, Method#parameters or UnboundMethod#parameters:

->(m1, o1=nil, *s, m2, &b){}.parameters
# => [[:req, :m1], [:opt, :o1], [:rest, :s], [:req, :m2], [:block, :b]]

However, in your case, I don't see why you need reflection, since you already know the names of the parameters anyway.