将所有单词的首字母大写，并保持已大写

Question

使用rails 4，并且在这方面找不到文档。我想用一个字符串把每个单词的第一个字母大写起来，但保留已经大写的字母。

我希望获得以下产出：

how far is McDonald's from here? => How Far Is McDonald's From Here?

MDMA is also known as molly => MDMA Is Also Known As Molly

i drive a BMW => I Drive A BMW

我原以为.titleize会这么做，但那会把BMW变成Bmw。谢谢你的帮助。

Answer 1

您可以尝试以下方法：

a.split.map{|x| x.slice(0, 1).capitalize + x.slice(1..-1)}.join(' ')
# or
a.split.map{|x| x[0].upcase + x[1..-1]}.join(' ')

#=> ["MDMA Is Also Known As Molly",
     "How Far Is McDonald's From Here?",
     "I Drive A BMW"]

Demonstration

Answer 2

您可以这样做一个自定义方法：

string = "your string IS here"
output = []
string.split(' ').each do |word|
  if word =~ /[A-Z]/
    output << word
  else
    output << word.capitalize
  end
end
output.join(' ')

当然，这不会改变像"tEST“或"tEst”这样的单词，因为其中至少有一个大写字母。

Answer 3

仅将第一个字母大写，同时保留现有大写：

your_string.then { |s| s[0].upcase + s[1..-1] }