優先使用 字符串插值 來代替 字符串串聯。

  # bad  email_with_name = user.name + ' <' + user.email + '>'  # good  email_with_name = "#{user.name} <#{user.email}>"  # good  email_with_name = format('%s <%s>', user.name, user.email)

    Consider padding string interpolation code with space. It more clearly sets the
    code apart from the string.考慮使用空格填充字符串插值。它更明確了除字符串的插值來源。

  "#{ user.last_name }, #{ user.first_name }"

    Consider padding string interpolation code with space. It more clearly sets the
    code apart from the string.
    考慮替字符串插值留白。