文字の配列を渡すと...英文式に列記してくれます。 %w(a b c).to_sentence #=> "a, b, and c" 記法を指定する事で %w(a b c).to_sentence(words_connector: ' or ', last_word_connector: ' or at least ') #=> "a or b or at least c" %w(a b c).to_sentenc…