重新大写第一个单词

Question

所以很明显这个问题之前已经被问过了，但是我真正要求的是特定于我写的代码。基本上我正在大写字（标题）。我的方法没有优化，而且它确实进入了圈子，所以只是忍耐。一旦我再次降低标题，我似乎无法重新评估标题的第一个字。我已经在代码中写下了评论，所以你可以在不分析整个事物的情况下轻松通过它。我不要求你写一个新的代码，因为我可以只是谷歌。我更感兴趣的是，为什么我的解决方案不工作..

input: "the hamster and the mouse" 
output: "the Hamster and the Mouse" 
WHAT I WANT: "The Hamster and the Mouse" 


class String 
    def titleize 
    #regex reads: either beginning of string or whitespace followed by alpha 
    self.gsub(/(\A|\s)[a-z]/) do |letter| 
     letter.upcase! 
    end 
    end 
end 

class Book 
    attr_accessor :title 

    def title=(title) 
    @title = title.titleize #makes every word capitalized 

    small_words = %w[In The And A An Of] 
    words = @title.split(" ") 

    #makes all the "small_words" uncapitalized again 

    words.each do |word| 
     if small_words.include?(word) 
     word.downcase! 
     end 
    end 

    words[0][0].upcase! #doesnt work 
    @title = words.join(" ") 

    #NEED TO MAKE FIRST WORD CAPITALIZED EVEN IF ITS A "small_word" 
    @title[0].upcase! #also doesnt work 

    end 

末

Answer 1

更换words[0][0].upcase!与words[0] = words[0].titleize。这将标题标题中的第一个单词，这是你想要的。你也不需要@title[0].upcase!。

Answer 2

更改从最后一行：

@title[0].upcase! 

要：

@title.capitalize! 

编辑： 我重写了类。较少的行，你不需要RegEx或String＃titleize方法。

class Book 
    attr_reader :title 

    def title=(title) 
     small_words = ["in", "the", "and", "a", "an", "of"] 

     @title = title.split.each do |word| 
      small_words.include?(word.downcase) ? word.downcase! : word.capitalize! 
     end 

     @title[0].capitalize! 
     @title = @title.join(" ") 
    end 
end 

new_book = Book.new 
new_book.title="the hamster and the mouse" 
new_book.title # => "The Hamster and the Mouse"