I would like to test whether a class inherits from another class, but there doesn't seem to exist a method for that.
class A
end
class B < A
end
B.is_a? A
=> false
B.superclass == A
=> true
A trivial implementation of what I want would be:
class Class
def is_subclass_of?(clazz)
return true if superclass == clazz
return false if self == Object
superclass.is_subclass_of?(clazz)
end
end
but I would expect this to exist already.
Just use the <
operator
B < A # => true
A < A # => false
or use the <=
operator
B <= A # => true
A <= A # => true