classical-2.js

function Parent() {
  console.log('hi from parent');                                                                    
} 

Parent.prototype.exampleMethod = function() {                                                       
  console.log('hi from parent method');                                                             
};
  
function Child() {                                                                                  
  Parent.call(this);                                                                                
  console.log('hi from child');
} 

Child.prototype = Object.create(Parent.prototype);                                                  
Child.prototype.constructor = Child;

Child.prototype.sayHey = function() {                                                               
  console.log('hey!');
};
                                                                                                    
function TeacherMixin() {                                                                           
  console.log('teacher mixin');
  this.type = 'teacher';
  this.test = function() {};
}
  
function ChildTeacher() {                                                                           
  TeacherMixin.call(this);
  Child.call(this);
};                                                                                                  

ChildTeacher.prototype = Object.assign(Child.prototype, TeacherMixin.prototype);

const child_teacher = new ChildTeacher;                                                             

child_teacher.exampleMethod();
child_teacher.sayHey();                                                                             
child_teacher.test();