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Validating Object Initialization Using Metaprogramming

Source: Common Ruby Idioms [stackoverflow.com]
 

class Ticket
  @remaining = 3
  def self.new
    if @remaining > 0
      @remaining -= 1
      super
    else
      "IOU"
    end
  end
end
Ticket.new #=> Ticket
Ticket.new #=> Ticket
Ticket.new #=> Ticket
Ticket.new #=> "IOU"

{{ tag }}, {{tag}},

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}
{{ parent.authors[0].realName || parent.author}}

{{ parent.authors[0].tagline || parent.tagline }}

{{ parent.views }} ViewsClicks
Tweet

{{parent.nComments}}