Ruby首字母大写每个单词

Question

我需要将每个单词的第一个字符设为大写字母,然后将其余字母设为小写字母...

manufacturer.MFA_BRAND.first.upcase

只设置第一个字母大写,但我需要这个:

ALFA ROMEO => Alfa Romeo
AUDI => Audi
BMW => Bmw
ONETWO THREE FOUR => Onetwo Three Four

Answer 1

在Rails中:

"kirk douglas".titleize => "Kirk Douglas"
#this also works for 'kirk_douglas'

没有Rails:

"kirk douglas".split(/ |\_/).map(&:capitalize).join(" ")

#OBJECT IT OUT
def titleize(str)
  str.split(/ |\_/).map(&:capitalize).join(" ")
end

#OR MONKEY PATCH IT
class String  
  def titleize
    self.split(/ |\_/).map(&:capitalize).join(" ")
  end
end

没有Rails(加载rails的ActiveSupport来修补#titleize方法String)

require 'active_support/core_ext'
"kirk douglas".titleize #=> "Kirk Douglas"

(某些)由#titleize处理的字符串用例

• "kirk douglas"
• "kirk_douglas"
• "柯克 - 道格拉斯"
• "柯克·道格拉斯"
• "柯克·道格拉斯"

#titleize陷阱

#titleize方法比最初期望的方法复杂一点,并且会产生意想不到的结果,尤其是@JamesMcMahon所指出的区分大小写的情况:

"hEy lOok".titleize #=> "H Ey Lo Ok"

因为它意味着处理像骆驼一样的代码:

"kirkDouglas".titleize #=> "Kirk Douglas"

要处理这种边缘情况,您可以titleize在运行#titleize之前先清理字符串.当然,如果你这样做,你将消灭任何基于camelCased的单词分隔:

"kirkDouglas".downcase.titleize #=> "Kirkdouglas"

Answer 2

试试这个:

puts 'one TWO three foUR'.split.map(&:capitalize).join(' ')

#=> One Two Three Four

要么

puts 'one TWO three foUR'.split.map(&:capitalize)*' '

Answer 3

"hello world".titleize 哪个应输出"Hello World".

Answer 4

另一个选择是使用正则表达式和gsub,它采用一个块:

'one TWO three foUR'.gsub(/\w+/, &:capitalize)

Answer 5

查看 String#capitalize 方法。

http://www.ruby-doc.org/core-1.9.3/String.html#method-i-capitalize

Answer 6

"hello world".split.each{|i| i.capitalize!}.join(' ')