#Ruby で配列の添字・順序を文字列から探す ( find_index )

["A","B","C","C","D"].find_index("A")
# => 0

["A","B","C","C","D"].find_index("B")
# => 1

# 複数見つかる場合も最初のものが返る
["A","B","C","C","D"].find_index("C")
# => 2

["A","B","C","C","D"].find_index("D")
# => 4

["A","B","C","C","D"].find_index("E")
# => nil

Original by Github issue

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