如何在Rails中使用.map

Question

Pig Latin

规则1：如果单词以元音开头，请添加“ay”声音 这个词的结尾。

规则2：如果一个单词以辅音开头，请将其移至最后 单词，然后在单词的末尾添加“ay”声音。

以下程序适用于ruby。但我对如何使用“地图”功能感到困惑？请参阅以下代码：

def translate(sentence)
  if sentence.include?(" ")
    words = sentence.split(" ").map do |word|       
      translate_word(word)                        
    end
    return  words.join(" ")
  else single_word = sentence
    translate_word(single_word)
  end
end

以上句子有效！但如果我使用：

words = sentence.split(" ")
words.map do |word|
  translate_word(word)
end

它不起作用！为什么？我以为他们是一样的......

def translate_word(w)
  vowels = %w[a e i o u]
  consonants = ("a".."z").to_a - vowels 

  if vowels.include?(w[0])
    w + "ay"
    elsif consonants.include?(w[0]) && vowels.include?(w[1]) && w[1] != "u"
      w[1..-1] + w[0] + "ay"
    elsif (consonants.include?(w[0]) && consonants.include?(w[1]) && vowels.include?(w[2]) && w[2] != "u") || (w[0] == "q" && w[1] == "u")
      w[2..-1] + w[0..1] + "ay"
    elsif (consonants.include?(w[0]) && consonants.include?(w[1]) && consonants.include?(w[2]) && vowels.include?(w[3])) 
      w[3..-1] + w[0..2] + "ay"
    elsif consonants.include?(w[0]) && w[1] == "q" && w[2] == "u"
      w[3..-1] + w[0..2] + "ay"
    end
end

Answer 1

#map函数返回一个你要解雇的新对象。 要保存结果，您应该将其分配回words，如下所示：

words = sentence.split(" ")
words = words.map do |word| 
  translate_word(word)
end

或者改为使用#map!。