JS: Object.prototype

What is Object.prototype

Object.prototype is the value of the property key "prototype" of the function Object. 〔see Object Object〕

console.assert(Object.hasOwn(Object, "prototype") === true);

Type

Type of Object.prototype is Object .

console.assert(typeof Object.prototype === "object");

Parent

Parent of Object.prototype is null.

console.assert(Reflect.getPrototypeOf(Object.prototype) === null);

Purpose

Object.prototype is the root parent of all standard objects.

So, for any property key k of Object.prototype, you can access it by obj.k where obj is any object. If the object obj has k as its own property, the own property is used.

Properties

Function Properties

• JS: Object.prototype.hasOwnProperty ❌
• JS: Object.prototype.isPrototypeOf
• JS: Object.prototype.propertyIsEnumerable ❌
• JS: Object.prototype.toString
• JS: Object.prototype.valueOf

• Object.prototype.toLocaleString

Data Property

• JS: Object.prototype.constructor

Getter/Setter Property

• JS: Object.prototype.__proto__ ❌