https://ruby-china.org/impzx en-us <p>class Array def one_by_one for i in 0..size yield(self[i]) end puts end end</p> <p>arr = [1,3,5,7,9]</p> <p>arr.one_by_one {|h| print (h*h)} </p> <p>写的实例代码 报错如下： 19254981one_by_one.rb:12:in <code>block in &lt;main&gt;': undefined method</code>*' for nil:NilClass (NoMethodError) from one_by_one.rb:4:in <code>block in one_by_one' from one_by_one.rb:3:in</code>each' from one_by_one.rb:3:in <code>one_by_one' from one_by_one.rb:12:in</code></p>'<p></p> <p>好奇，为啥*没有了？</p> impzx Wed, 15 Jan 2014 11:15:48 +0800 https://ruby-china.org/topics/16813 https://ruby-china.org/topics/16813 <p>想请问一下，manifest.yml 文件的作用，如何写这个文件。是否有文档。</p> impzx Thu, 09 Jan 2014 14:24:45 +0800 https://ruby-china.org/topics/16707 https://ruby-china.org/topics/16707 <p>ruby 新手，想请问下，ruby 中怎么工程化管理代码， 比如在 java 中我用 maven。那在 ruby 中如何管理呢？</p> impzx Fri, 03 Jan 2014 17:21:12 +0800 https://ruby-china.org/topics/16599 https://ruby-china.org/topics/16599 <p>新人报到，大家多多关照。。</p> impzx Fri, 06 Dec 2013 23:35:18 +0800 https://ruby-china.org/topics/16048 https://ruby-china.org/topics/16048