Ruby 将每个单词的第一个字母大写
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Ruby capitalize every word first letter
提问by byCoder
I need to make the first character of every word uppercase, and make the rest lowercase...
我需要将每个单词的第一个字符设为大写，其余字符设为小写...
manufacturer.MFA_BRAND.first.upcase
is only setting the first letter uppercase, but I need this:
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
回答by boulder_ruby
In Rails:
在导轨中：
"kirk douglas".titleize => "Kirk Douglas"
#this also works for 'kirk_douglas'
w/o Rails:
不带导轨：
"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
w/o Rails (load rails's ActiveSupport to patch #titleize method to String)
w/o Rails（加载 rails 的 ActiveSupport 以将 #titleize 方法修补到String）
require 'active_support/core_ext'
"kirk douglas".titleize #=> "Kirk Douglas"
(some) string use cases handled by #titleize
#titleize 处理的（一些）字符串用例
- "kirk douglas"
- "kirk_douglas"
- "kirk-douglas"
- "kirkDouglas"
- "KirkDouglas"
- “柯克·道格拉斯”
- “柯克道格拉斯”
- “柯克-道格拉斯”
- “柯克道格拉斯”
- “柯克道格拉斯”
#titleize gotchas
#titleize 陷阱
Rails's titleizewill convert things like dashes and underscores into spaces and can produce other unexpected results, especially with case-sensitive situations as pointed out by @JamesMcMahon:
Railstitleize会将破折号和下划线之类的内容转换为空格，并可能产生其他意想不到的结果，尤其是@JamesMcMahon 指出的区分大小写的情况：
"hEy lOok".titleize #=> "H Ey Lo Ok"
because it is meant to handle camel-cased code like:
因为它是为了处理像骆驼那样的代码：
"kirkDouglas".titleize #=> "Kirk Douglas"
To deal with this edge case you could clean your string with #downcasefirst before running #titleize. Of course if you do that you will wipe out any camelCased word separations:
要处理这种#downcase极端情况，您可以在运行#titleize 之前先使用清理字符串。当然，如果你这样做，你将消除任何驼峰式分词：
"kirkDouglas".downcase.titleize #=> "Kirkdouglas"
回答by boulder_ruby
try this:
尝试这个：
puts 'one TWO three foUR'.split.map(&:capitalize).join(' ')
#=> One Two Three Four
or
或者
puts 'one TWO three foUR'.split.map(&:capitalize)*' '
回答by tint lwin lwin win
"hello world".titleizewhich should output "Hello World".
"hello world".titleize应该输出“Hello World”。
回答by Bob Nadler
Another option is to use a regex and gsub, which takes a block:
另一种选择是使用正则表达式和 gsub，它需要一个块：
'one TWO three foUR'.gsub(/\w+/, &:capitalize)
回答by Robert 'Jet' Rowe
Look into the String#capitalize method.
查看 String#capitalize 方法。
http://www.ruby-doc.org/core-1.9.3/String.html#method-i-capitalize
http://www.ruby-doc.org/core-1.9.3/String.html#method-i-capitalize
回答by Muhamamd Awais
"hello world".split.each{|i| i.capitalize!}.join(' ')
回答by astee
If you are trying to capitalize the first letter of each word in an array you can simply put this:
如果您试图将数组中每个单词的第一个字母大写，您可以简单地输入：
array_name.map(&:capitalize)
array_name.map(&:大写)
