Ruby３.１
Enumeratorクラスwith_index
Enumerableモジュールeach_with_index
要素にインデックスを添えて繰り返す
a = ["a","b","c"]
a.each.with_index(2) do |s, i|
puts "#{i}:#{s}"
end
2:a
3:b
4:c
#each.with_index(引数)とすることで、引数を受け取る。
#each_with_indexは引数を受け取らないため、添字は０から始まる
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