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「%W」がわかりません - どういう意味ですか?
string[index].capitalize! unless %w(the and over).include?(string[index])
確認してください%Q, %q, %W, %w, %x, %r, %s。
%Q, %q, %W, %w, %x, %r, %s
これは大いに役立ちます。