Rails 列表有 .first 和 .second —— 有 .hundredth 或 .sixty_nineth 吗? [英] Rails lists have .first and .second – is there a .hundredth or .sixty_nineth ?

问题描述

Rails 是否有一个类或其他扩展允许比系列中的前几个元素(和最后一个)更多的元素?这些工作:

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:

[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

那么在哪里?

list.sixth
list.hundredth 

推荐答案

Rails 曾经添加过这些，但是有很多 争议 所以大部分都被删除了.这个实验的唯一残余是Array#forty_two:

There was a time when Rails added these, but there was a lot of controversy so most were removed. The only remnant of this experiment is Array#forty_two:

(1..100).to_a.forty_two
# => 42

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