Arrays 在数组中拆分数组

我想在一个数组中拆分数组，并混合第二个元素的字符串

[["c","a","t"], ["d","o","g"]]
...
# => "ao"

我怎么做？我尝试了

join

方法，得到了第二个和第五个。但当字长不同时，如下图所示：

[["b","i","r","d"], ["c","a","t"]]

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我不知道怎么做。你能给我一些建议吗？

你可以试试这样的：

> ary = [["c","a","t"], ["d","o","g"]]
=> [["c", "a", "t"], ["d", "o", "g"]]
> ary.map{|a| a[1]}.join
=> "ao"

> [["c","a","t"], ["d","o","g"]].collect{|e| e[1]}.join
=> "ao"

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希望这会有所帮助

a = [["b","i","r","d"], ["c","a","t"]]
result = a.collect{ |_,s,*__| s }.join
p result 
# => "ia"