name.rb

class Name
  # Define default getter methods, but not setter methods.
  attr_reader :first, :last
  # When someone tries to set a first name, enforce rules about it.
  def first=(first)
    if first.nil? || first.empty?
      raise ArgumentError, 'Everyone must have a first name.'
    end

    # first = first.dup
    first[0] = first[0].chr.capitalize
    @first = first
  end

  # When someone tries to set a last name, enforce rules about it.
  def last=(last)
    if last.nil? || last.empty?
      raise ArgumentError, 'Everyone must have a last name.'
    end

    @last = last
  end

  def full_name
    "#{@first} #{@last}"
  end

  # Delegate to the setter methods instead of setting the instance
  # variables directly.
  def initialize(first, last)
    self.first = first
    self.last = last
  end
end