Comparison operator `<=>` and booleans [closed]

Question

The <=> operator does not handle booleans well.

true <=> true # => 0
true <=> false # => nil

Is this behavior intended by design or am I missing something? I expect:

true <=> false # => 1
false <=> true # => -1

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Edit This is what I was looking for:

false.to_i <=> true.to_i # => -1

Answer 1

The <=> operator isn't really a "combined boolean"; it is for ordering items of the same class, if they have an order defined. Numbers are ordered; 1 is greater than 0 and 0 is less than 8675309. Boolean values don't have an inherent order; true isn't greater than false or vice versa.

Answer 2

They are not the same class. true is a singleton of TrueClass, while false is a singleton of FalseClass. You're comparing apples and oranges (or, in true <=> true case, an apple with the same apple).

For curiosity's sake, why do you think true <=> false should equal 1? EDIT: beaten to it by sawa