ruby - 将多个 gsub 语句重构为 1

Question

尝试将其重构为一行以使字符串中的所有元音字母大写。我尝试使用哈希，但失败了。尽管我已尽最大努力进行查找，但对 Ruby 仍然太陌生，不知道任何替代方案。像.... str.gsub!(/aeiou/

def LetterChanges(str)
  str.gsub!(/a/, "A") if str.include? "a"
  str.gsub!(/e/, "E") if str.include? "e"
  str.gsub!(/i/, "I") if str.include? "i"
  str.gsub!(/o/, "O") if str.include? "o"
  str.gsub!(/u/, "U") if str.include? "u"
  puts str
end

Answer 1

最好的办法是

str.tr('aeiou', 'AEIOU')

String#tr

Returns a copy of str with the characters in from_str replaced by the corresponding characters in to_str. If to_str is shorter than from_str, it is padded with its last character in order to maintain the correspondence.