Ruby-on-rails Rails 列表有 .first 和 .second —— 有 .hundredth 或 .sixty_nineth 吗？
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Rails lists have .first and .second – is there a .hundredth or .sixty_nineth ?
提问by New Alexandria
Is there a class or other extension for Rails that allows more than the first few elements in a series (and the last)? These work:
是否有 Rails 的类或其他扩展允许多于系列中的前几个元素（和最后一个）？这些工作：
[2,45,2,14,53,23,634,346,34,46,643,634,346,34,34].fifth
# -> 53
[2,45,2,14,53,23,634,346,34,46,643,634,346,34,34].last
# -> 34
so where is?
那么在哪里？
list.sixth
list.hundredth
回答by tadman
There was a time when Rails added these, but there was a lot of controversyso most were removed. The only one of this experiment that remains is Array#forty_two.
有一段时间 Rails 添加了这些，但有很多争议，所以大部分都被删除了。这个实验中唯一剩下的就是Array#forty_two。
回答by Tim
You can just use square brackets:
您可以只使用方括号：
list[6]
list[100]
回答by Samnang
In activesupport, it does monkey patching few of these methods into Array class. If you really want more, you can take a look how to implement from activesupport:
在 activesupport 中，它确实将这些方法中的一些方法修补到 Array 类中。如果你真的想要更多，你可以看看如何从 activesupport 实现：
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/array/access.rb
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/array/access.rb
