我可以在Ruby 1.9.x中使用无参数函数吗？

因此，我正在研究，我遇到了一个问题，我认为这是特定于

ruby

1.9.x的

def test_calling_global_methods_without_parentheses

    result = my_global_method 2, 3
    assert_equal 5, result 
end

我明白了：

james@tristan:~/code/ruby_projects/ruby_koans$ rake
(in /home/james/code/ruby_projects/ruby_koans)
cd koans
/home/james/.rvm/rubies/ruby-1.9.2-p180/bin/ruby path_to_enlightenment.rb
/home/james/code/ruby_projects/ruby_koans/koans/about_methods.rb:21:in `eval': (eval):1: syntax error, unexpected tINTEGER, expecting keyword_do or '{' or '(' (SyntaxError)
assert_equal 5, my_global_method 2, 3
                                  ^
    from /home/james/code/ruby_projects/ruby_koans/koans/about_methods.rb:21:in `test_sometimes_missing_parentheses_are_ambiguous'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:377:in `meditate'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:449:in `block in walk'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:460:in `block (3 levels) in each_step'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:458:in `each'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:458:in `block (2 levels) in each_step'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in `each'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in `each_with_index'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in `block in each_step'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:455:in `catch'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:455:in `each_step'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:448:in `walk'
    from /home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:470:in `block in <top (required)>'
rake aborted!
Command failed with status (1): [/home/james/.rvm/rubies/ruby-1.9.2-p180/bi...]
/home/james/code/ruby_projects/ruby_koans/Rakefile:86:in `block in <top (required)>'
(See full trace by running task with --trace)
james@tristan:~/code/ruby_projects/ruby_koans$

james@tristan：~/code/ruby_项目/ruby_koans$rake
（in/home/james/code/ruby_projects/ruby_koans）
cd koans
/home/james/.rvm/rubies/ruby-1.9.2-p180/bin/ruby-path_-to_-induction.rb
/home/james/code/ruby_projects/ruby_koans/koans/about_methods.rb:21:in'eval'：（eval）：1:语法错误，意外的tINTEGER，应为关键字_do或“{”或“（”（SyntaxError）
断言等于5，我的全局方法2，3
^
from/home/james/code/ruby_projects/ruby_koans/koans/about_methods.rb:21:test_中有时缺少括号是不明确的
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:377:in“冥想”
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:449:in'block in walk'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:460:in“每个步骤中的块（3个级别）”中
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:458:in'each'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:458:in“每个步骤中的块（2个级别）”中
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in'each'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in'each_with_index'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:457:in'block in each_step'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:455:in'catch'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:455:in'each_step'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:448:in'walk'
from/home/james/code/ruby_projects/ruby_koans/koans/edgecase.rb:470:in'block in'
雷克流产了！
命令失败，状态为（1）：[/home/james/.rvm/rubies/ruby-1.9.2-p180/bi…]
/home/james/code/ruby_projects/ruby_koans/Rakefile:86:in'block in'
（通过使用--trace运行任务查看完整跟踪）
james@tristan：~/code/ruby_projects/ruby_koans$

---

我查看了GitHub上的几个不同的存储库，它们声称最近（在过去两个月内）完成了Koans，我只看到了我使用的答案（第一个代码片段）。那么，是我的代码、Ruby安装还是其他什么原因？

我不知道为什么，但代码的评估如下：

def test_calling_global_methods_without_parentheses
  assert_equal 5, my_global_method 2, 3
end

---

问题是，这是含糊不清的，可能意味着

assert_equal（5，my_global_method（2,3））

或

assert_equal（5，my_global_method（2,3））

。在这种特定情况下，您必须使用括号。

您得到的错误不是来自您列出的代码，而是来自相关文件的下面的代码。注释说明：

注意：我们在下面使用eval，因为示例代码被认为在语法上无效

---

不要忘记删除方法调用和第一个参数之间的空格

这样做

eval“断言等于5，我的全局方法（2,3）”

而不是

---

eval“assert_equal 5，my_global_method（2,3）”#小心空格！

谢谢！这也提醒我，我真的需要更多地了解错误。。。