Comparing Object.create with Object.prototype to creating a task using the Object.create method

Question

Comparing Object.create with Object.prototype to creating a task using the Object.create method

When it comes to creating a new object, what's the rationale behind using

var task=Object.create(Object.prototype); instead of var task=Object.create(Object);

javascript object prototype

Answer 1

Answer №1

Within the realm of MDN Object.create(), we encounter two illustrative scenarios:

const me = Object.create(person)

Rectangle.prototype = Object.create(Shape.prototype)

A fusion of these examples results in a cohesive sample:

function Shape() {
  this.x = 0;
  this.y = 0;
  this.speak = function() {
    console.log("this is an instance function")
  }
}
// Shape.speak = ...

Shape.prototype.move = function(x, y) {
  this.x += x;
  this.y += y;
  console.info('this is a prototype function');
};

function Rectangle() { Shape.call(this); }
function Triangle() { Shape.call(this); }

Rectangle.prototype = Object.create(Shape.prototype);
Triangle.prototype = Object.create(Shape);

var rect = new Rectangle();
var tri = new Triangle();

rect.constructor // f Shape
tri.constructor // f Function

rect.speak // f speak
tri.speak // f speak

rect.move // f move
tri.move // undefined, could not access methods in Shape.prototype

The outcome of

Rectangle.prototype = Object.create(Shape.prototype)

can be expressed as

rect.__proto__.__proto__  ===  Shape.prototype

Similarly, the result of

Triangle.prototype = Object.create(Shape)

equates to

tri.__proto__.__proto__ === Shape

To delve deeper into this concept, let us explore the essence of Object.create() Polyfill

Object.create = function (proto, propertiesObject) {
  function F() {}
  F.prototype = proto;

  // (new F()).__proto__ === F.prototype === proto
  return new F(); 
};

This cascades into:

(new F()).__proto__ === F.prototype === Shape.prototype
Rectangle.prototype === new F()
rect.__proto__.__proto__ === Rectangle.prototype.__proto__  === (new F()).__proto__ === Shape.prototype

(new F()).__proto__ === F.prototype === Shape
Triangle.prototype === new F()
tri.__proto__.__proto__ === (Triangle.prototype).__proto__ === (new F()).__proto__ === Shape

Answer 2

Within the realm of MDN Object.create(), we encounter two illustrative scenarios:

const me = Object.create(person)

Rectangle.prototype = Object.create(Shape.prototype)

A fusion of these examples results in a cohesive sample:

function Shape() {
  this.x = 0;
  this.y = 0;
  this.speak = function() {
    console.log("this is an instance function")
  }
}
// Shape.speak = ...

Shape.prototype.move = function(x, y) {
  this.x += x;
  this.y += y;
  console.info('this is a prototype function');
};

function Rectangle() { Shape.call(this); }
function Triangle() { Shape.call(this); }

Rectangle.prototype = Object.create(Shape.prototype);
Triangle.prototype = Object.create(Shape);

var rect = new Rectangle();
var tri = new Triangle();

rect.constructor // f Shape
tri.constructor // f Function

rect.speak // f speak
tri.speak // f speak

rect.move // f move
tri.move // undefined, could not access methods in Shape.prototype

The outcome of

Rectangle.prototype = Object.create(Shape.prototype)

can be expressed as

rect.__proto__.__proto__  ===  Shape.prototype

Similarly, the result of

Triangle.prototype = Object.create(Shape)

equates to

tri.__proto__.__proto__ === Shape

To delve deeper into this concept, let us explore the essence of Object.create() Polyfill

Object.create = function (proto, propertiesObject) {
  function F() {}
  F.prototype = proto;

  // (new F()).__proto__ === F.prototype === proto
  return new F(); 
};

This cascades into:

(new F()).__proto__ === F.prototype === Shape.prototype
Rectangle.prototype === new F()
rect.__proto__.__proto__ === Rectangle.prototype.__proto__  === (new F()).__proto__ === Shape.prototype

(new F()).__proto__ === F.prototype === Shape
Triangle.prototype === new F()
tri.__proto__.__proto__ === (Triangle.prototype).__proto__ === (new F()).__proto__ === Shape

Comparing Object.create with Object.prototype to creating a task using the Object.create method

Answer №1

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