What does "" (two double quotes) do in Ruby?

I've seen Ruby code in which there are only two doub开发者_如何学Gole quotes ("") on a line. What does that line do?

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I assume you might have seen a code like this.

def some_method
   #do some operations
   ""
end

In this context, it means that the method is returning an empty string. In Ruby, the last evaluated operation in a method is what is returned from that method. So in this case, it returns an empty string literal.

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Two double quotes represent an literal empty string in Ruby. And in many other languages.