回答編集履歴
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更新
test
CHANGED
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@@ -4,10 +4,20 @@
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```Ruby
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ary = ["aaa,bbb,ccc", "sss,fff,vvv", "ttt,yyy,eee"]
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ary1 = ["aaa,bbb,ccc", "sss,fff,vvv", "ttt,yyy,eee"]
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ary2 = ["adaa,bbb,cdcc,addaa", "sss,assaa,fff,vvv", "tthhht,yhhhyy,eyyyuee"]
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n = 0 #各要素の先頭からn番目
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p ary.map{|str|str.split(',')[n]}
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p ary1.map{|str| str.split(',')[n] }.join(',') #=> aaa,sss,ttt
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p ary2.map{|str| str.split(',')[n] }.join(',') #=> adaa,sss,tthhht
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```
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念のために言うと、Rubyの配列は可変長です。
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