Splitting a symbol, in the same manner as one woul

问题:

Is it possible to split a symbol without first converting it to a string? For example, I've tried

:split_this.split("_")

and it only returns an error. I've looked through the Symbol class reference, but all the example use to_s to convert it to a string.

I know I can convert it to a string, split it, and convert the two substrings to symbols, but that just seems a bit cumbersome. Is there a more elegant way to do this?

回答1:

Since Ruby 1.9 some string's features are added to the Symbol class but not this much.The best you can do, I think is:

:symbol_with_underscores.to_s.split('_').map(&:to_sym)

You could turn this into a Symbol method:

class Symbol
  def split(separator)
    to_s.split(separator).map(&:to_sym)
  end
end

:symbol_with_underscores.split('_')
# => [:symbol, :with, :underscores]

回答2:

Think about symbols as numbers. Because symbols are internally stored as int numbers. Therefore they don't have string related methods.