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.rb
  # ページごとの完全なタイトルを返す
  def full_title(page_title = '')
    base_title = "Ruby on Rails Tutorial Sample App"
    if page_title.empty?
      base_title
    else
      "#{page_title} | #{base_title}"
    end
  end

のようなヘルパーを作成することで

.application.html.erb
<%= full_title(yield(:title)) %>

で呼び出すことができる

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