How to get argument names using reflection

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In Ruby 1.9.2, you can trivially get the parameter list of any Proc (and thus of course also of any Method or UnboundMethod) with Proc#parameters:

A.instance_method(:method1).parameters # => [[:req, :tuti], [:req, :fruity]]

The format is an array of pairs of symbols: type (required, optional, rest, block) and name.

For the format you want, try

A.instance_method(:method1).parameters.map(&:last).map(&:to_s)
  # => ['tuti', 'fruity']

Of course, that still doesn’t give you access to the caller, though.

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