Нужны ли классы в JavaScript?

class.js

function MyCustomType(value) {
  this.property = value;
}

MyCustomType.prototype.method = function() {
  return this.property;
};

ecmascript-class.js

class MyCustomType {
  constructor(value) {
    this.property = value;
  }

  method() {
    return this.property;
  }
}

ecmascript-inherits.js

class Animal {
  constructor(name) {
    this.name = name;
  }

  sayName() {
    console.log(this.name);
  }
}

class Dog extends Animal {
  constructor(name) {
    super(name);
  }

  bark() {
    console.log('Woof!');
  }
}

inherits.js

function Animal(name) {
  this.name = name;
}

Animal.prototype.sayName = function() {
  console.log(this.name);
};

function Dog(name) {
  Animal.call(this, name);
}

Dog.prototype = new Animal(null);
Dog.prototype.bark = function() {
  console.log('Woof!');
};