ruby首字母大写

ruby首字母大写

str.capitalize! → str or nil

Modifies  str  by converting the first character to uppercase and the remainder to lowercase. Returns  nil  if no changes are made. Note: case conversion is effective only in ASCII region.

   a = "hello"
   a.capitalize!   #=> "Hello"
   a               #=> "Hello"
   a.capitalize!   #=> nil

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