删除 Ruby 数组中冗余或重复的元组 [英] Remove redundant or duplicate tuples in Ruby array

问题描述

想象以下 Ruby 数组:

Imagine the following Ruby array:

[9, 9, 5, 5, 5, 2, 9, 9]

删除冗余元组的最简单方法是什么，产生如下输出:

What's the easiest way of removing redundant tuples, producing an output like the following:

[9, 5, 2, 9]

uniq 不正确，因为它正在检查整个数组.输入的顺序很重要，必须保持.对此有直接的方法吗?

uniq is not correct because it's examining the entire array. The ordering of the input is important and must be kept. Is there a straightforward approach to this?

谢谢！

推荐答案

我会使用 Enumerable#chunk

2.0.0-p0 :001 > a = [9, 9, 5, 5, 5, 2, 9, 9]
 => [9, 9, 5, 5, 5, 2, 9, 9] 
2.0.0-p0 :002 > a.chunk { |e| e }.map(&:first)
 => [9, 5, 2, 9]

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