How to extract the sign of an integer in Ruby?

I think that it's nonsense not to have a method that just gives -1 or +1. Even BASIC has such a function SGN(n). Why should we have to deal with Strings when it's numbers we want to work with. But's that's just MHO.

def sgn(n)
  n <=> 0
end.

Here is a simple way to do it:

x = -3
"++-"[x <=> 0] # => "-"

x = 0
"++-"[x <=> 0] # => "+"

x = 3
"++-"[x <=> 0] # => "+"

or

x = -3
"±+-"[x <=> 0] # => "-"

x = 0
"±+-"[x <=> 0] # => "±"

x = 3
"±+-"[x <=> 0] # => "+"