How to implement options hashes in Ruby?

Question

How can I implement options hashes? How is the structure of a class that has option hashes in it? Say I have a person class. I want to implement a method such as my_age that whe

Answer 1

class Person
  def birth_date
    Time.parse('1776-07-04')
  end

  def my_age(opts=nil)
    opts = {
      as_of_date: Time.now, 
      birth_date: birth_date,
      unit: :year
    }.merge(opts || {})
    (opts[:as_of_date] - opts[:birth_date]) / 1.send(opts[:unit])
  end
end