重新大寫第一個單詞

Question

所以很明顯這個問題之前已經被問過了，但是我真正要求的是特定於我寫的代碼。基本上我正在大寫字（標題）。我的方法沒有優化，而且它確實進入了圈子，所以只是忍耐。一旦我再次降低標題，我似乎無法重新評估標題的第一個字。我已經在代碼中寫下了評論，所以你可以在不分析整個事物的情況下輕鬆通過它。我不要求你寫一個新的代碼，因爲我可以只是谷歌。我更感興趣的是，爲什麼我的解決方案不工作..

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

更換words[0][0].upcase!與words[0] = words[0].titleize。這將標題標題中的第一個單詞，這是你想要的。你也不需要@title[0].upcase!。

Answer 2

更改從最後一行：

@title[0].upcase! 

要：

@title.capitalize! 

編輯： 我重寫了類。較少的行，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"