Method: Object#is_a?

Defined in:
object.c

#is_a? ⇒ Boolean #kind_of? ⇒ Boolean

Returns true if class is the class of obj, or if class is one of the superclasses of obj or modules included in obj.

module M;    end
class A
  include M
end
class B < A; end
class C < B; end

b = B.new
b.is_a? A          #=> true
b.is_a? B          #=> true
b.is_a? C          #=> false
b.is_a? M          #=> true

b.kind_of? A       #=> true
b.kind_of? B       #=> true
b.kind_of? C       #=> false
b.kind_of? M       #=> true

Overloads:

  • #is_a? ⇒ Boolean

    Returns:

    • (Boolean)
  • #kind_of? ⇒ Boolean

    Returns:

    • (Boolean) 


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# File 'object.c', line 641

VALUE
rb_obj_is_kind_of(VALUE obj, VALUE c)
{
    VALUE cl = CLASS_OF(obj);

    c = class_or_module_required(c);
    c = RCLASS_ORIGIN(c);
    while (cl) {
	if (cl == c || RCLASS_M_TBL_WRAPPER(cl) == RCLASS_M_TBL_WRAPPER(c))
	    return Qtrue;
	cl = RCLASS_SUPER(cl);
    }
    return Qfalse;
}