ruby 语法错误，意外的 $end，期待 keyword_end

Question

下面的代码显示错误如下:

"ruby -KU -- 'C:\Users\Ishmael\My Documents\Aptana Studio 3 Workspace\Simple\FirstFile'
C:/Users/Ishmael/My Documents/Aptana Studio 3 Workspace/Simple/FirstFile:55: syntax error, unexpected $end, expecting keyword_end"

我搜索了额外的结尾和尾随的“.”，但没有成功，我仍然无法弄清楚为什么它不起作用!

class Greeter
  attr_accessor :name

  def initialize(name="dudes")
    @name=name
  end

  def say_hi

    if @name.nil?
      puts "..."
    else if @name.respond_to?("each")

      @name.each do |name|
        puts "Hello #{name.capitalize}!"
      end

    else
      puts "Hi #{@name.capitalize}!"
    end

  end 

  def say_bye

    if @name.nil?
      puts "..."
    else if @name.respond_to?("join")
      puts 'Goodbye #{@name.join(", ").capitalize}! Come back soon!'
    else
      puts "Bye #{@name.capitalize}!"
    end

  end

end

if __FILE__ == $0

  greeter = Greeter.new
  greeter.say_hi
  greeter.say_bye

  greeter.name = "Ishmael"
  greeter.say_hi
  greeter.say_bye

  greeter.name = ["Albert", "Brenda", "Charles", "Dave", "Englebert"]
  greeter.say_hi
  greeter.say_bye

  greeter.name = nil
  greeter.say_hi
  greeter.say_bye
end

Answer 1

它不是提示额外的 end，而是文件过早结束，因为缺少 end。在这种情况下，您忘记在 if __FILE__ == $0 部分之前关闭类(class)。

这可能是因为您混淆了 elsif 和 else if，后者创建了一个全新的 if block 。