unused code

on the other hand, dead, unused code only clutters a program and makes it harder to read and understand, so delete it.

另一方面，无效的，废弃的代码只会使程序变得拥挤不堪，难于阅读和理解，所以还是删掉的好。

leaving dead code unattended can eventually lead to performance issues as the system becomes weighed down with unused code.

对死代码置之不理，最终可能会因为系统中的未用代码过多而导致性能问题。

just like you should clean out unused code, also remove tests that are no longer applicable.

正像你需要清理不用的代码。你也需要清理不再有用的测试。

remove unused code or unused features.

删除不用的代码或者特性。

a good sign -- pmd could find no examples of unused code within statcvs

一个好标志——PMD在StatCVS中找不到未使用代码的例子。