End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method · added in Ruby 3.1

Class#subclasses

subclasses → array

VALUE
rb_class_subclasses(VALUE klass)
{
    return class_descendants(klass, true);
}

Returns an array of classes where the receiver is the direct superclass of the class, excluding singleton classes. The order of the returned array is not defined.

Example

class A; end
class B < A; end
class C < B; end
class D < A; end

A.subclasses        #=> [D, B]
B.subclasses        #=> [C]
C.subclasses        #=> []

Ruby version changes

3.1

Class#subclasses, which returns an array of classes directly inheriting from the receiver, not including singleton classes. [Feature #18273]

Example

class A; end
class B < A; end
class C < B; end
class D < A; end
A.subclasses    #=> [D, B]
B.subclasses    #=> [C]
C.subclasses    #=> []

See also #new #superclass #json_creatable? also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2

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