使用Excel的库 - jxl？(Library for working with Excel - jxl?)

 我个人更喜欢这样的： 
 
def self.parse(arg)
  key, value = arg.to_s.split(':')
  {
    'nil'     => new(nil), 
    'string'  => new(value),
    'boolean' => new(value == 'true'),
    'symbol'  => new(value.to_sym),
    'number'  => new(value.include?('.') ? BigDecimal(value) : Integer(value))
  }[key]
end
 
 上面的代码实际上是2行，为了可读性分成多行。 但是，如果使用case是必须的，那么您可以将您的代码更改为： 
 
def self.parse(arg)
  key, value = arg.to_s.split(':')
  case key
  when 'nil' then new(nil)
  when 'string' then new(value)
  when 'boolean' then new(value == 'true')
  when 'symbol' then new(value.to_sym)
  when 'number' then new(value.include?('.') ? BigDecimal(value) : Integer(value))
  end
end

I would personally prefer this:
 
def self.parse(arg)
  key, value = arg.to_s.split(':')
  {
    'nil'     => new(nil), 
    'string'  => new(value),
    'boolean' => new(value == 'true'),
    'symbol'  => new(value.to_sym),
    'number'  => new(value.include?('.') ? BigDecimal(value) : Integer(value))
  }[key]
end
 
Code above is actually of 2 lines, broken into multiple lines for readability sake. However, if using case is a must then you can change your code to this:
 
def self.parse(arg)
  key, value = arg.to_s.split(':')
  case key
  when 'nil' then new(nil)
  when 'string' then new(value)
  when 'boolean' then new(value == 'true')
  when 'symbol' then new(value.to_sym)
  when 'number' then new(value.include?('.') ? BigDecimal(value) : Integer(value))
  end
end