Rails Array method second/third/second_to_last
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http://api.rubyonrails.org/classes/Array.html#method-i-second
[27] pry(main)> list = ["a", "b", "c", "d"]=> ["a", "b", "c", "d"][28] pry(main)> list.first=> "a"[29] pry(main)> list.second=> "b"[30] pry(main)> list.third=> "c"[32] pry(main)> list.second_to_last=> "c"
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