 
      
      extend()
	Extend obj_1 to obj_2. All of attributes and functions of obj_2 will be inherited to obj_1	
	
extend(obj_1, obj_2)
obj_1 (object)  — An objectobj_2 (object)  — An object
boolean — Always returns true
a = some_object()
b = another_object()
 
extend(a, b)