string_interpolation.rb

class A
  def initialize
    @a = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt"
    @b = "ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris"
  end

  def to_s
    @a[0] + @b[0]
  end
end

arr = []
5.times { arr << A.new }

puts " --- to_s --- "
puts arr.to_s
puts
puts " --- inspect --- "
puts arr.inspect
puts
puts " --- puts --- "
puts arr
puts
puts " --- String Interpolation --- "
puts "#{arr}"