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Object.create – Object Creation in JavaScript P6 – FunFunFunction #57

Object.create() – JavaScript | MDN

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Summary of article content: Articles about Object.create() – JavaScript | MDN The Object.create() method creates a new object, using an existing object as the prototype of the newly created object. …
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Object.create() - JavaScript | MDN — Object.create() – JavaScript | MDN

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PhÆ°Æ¡ng thá»©c Äá»i tÆ°á»£ng create ()

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Summary of article content: Articles about JavaScript Objects Create a single object, using an object literal. · Create a single object, with the keyword new . · Define an object constructor, and then create objects of the … …
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Summary of article content: Articles about Object.create( ) In JavaScript – GeeksforGeeks Object.create() method is used to create a new object with the specified prototype object and properties. Object.create() method returns a … …
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Javascript Object.create()

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Summary of article content: Articles about JavaScript Object create() Method – javatpoint The Object.create() method is used to create a new object with the specified prototype object and properties. We can create an object without a prototype by … …
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Object.create() – JavaScript

A new object with null prototype can behave in unexpected ways, because it doesn’t inherit any object methods from Object.prototype . This is especially true when debugging, since common object-property converting/detecting utility functions may generate errors, or lose information (especially if using silent error-traps that ignore errors).

For example, the lack of Object.prototype.toString() often makes debugging intractable:

const normalObj = { } ; const nullProtoObj = Object . create ( null ) ; console . log ( “normalObj is: ” + normalObj ) ; console . log ( “nullProtoObj is: ” + nullProtoObj ) ; alert ( normalObj ) ; alert ( nullProtoObj ) ;

Other methods will fail as well.

normalObj . valueOf ( ) nullProtoObj . valueOf ( ) normalObj . hasOwnProperty ( “p” ) nullProtoObj . hasOwnProperty ( “p” ) normalObj . constructor nullProtoObj . constructor

We can add the toString method back to the null-prototype object by simply assigning it one:

nullProtoObj . toString = Object . prototype . toString ; console . log ( nullProtoObj . toString ( ) ) ; console . log ( “nullProtoObj is: ” + nullProtoObj ) ;

Unlike normal objects, in which toString() is on the object’s prototype, the toString() method here is an own property of nullProtoObj . This is because nullProtoObj has no ( null ) prototype.

In practice, objects with null prototype are usually used as a cheap substitute for maps. The presence of Object.prototype properties will cause some bugs:

const ages = { alice : 18 , bob : 27 } ; function hasPerson ( name ) { return name in ages ; } function getAge ( name ) { return ages [ name ] ; } hasPerson ( “hasOwnProperty” ) getAge ( “toString” )

Using a null-prototype object removes this hazard without introducing too much complexity to the hasPerson and getAge functions:

const ages = Object . create ( null , { alice : { value : 18 , enumerable : true } , bob : { value : 27 , enumerable : true } , } ) ; hasPerson ( “hasOwnProperty” ) getAge ( “toString” )

In such case, the addition of any method should be done cautiously, as they can be confused with the other key-value pairs stored as data.

Making your object not inherit from Object.prototype also prevents prototype pollution attacks. If a malicious script adds a property to Object.prototype , it will be accessible on every object in your program, except objects that have null prototype.

Phương thức đối tượng create ()

Được giới thiệu trong ES5.

Tạo một đối tượng mới, với nguyên mẫu được chỉ định.

Sử dụng:

const newObject = Object. create ( prototype )

Thí dụ:

const animal = {} const dog = Object. create ( animal )

Đối tượng mới được tạo sẽ kế thừa tất cả các thuộc tính của đối tượng nguyên mẫu.

Bạn có thể chỉ định một tham số thứ hai để thêm các thuộc tính mới vào đối tượng mà nguyên mẫu thiếu:

const newObject = Object. create ( prototype , newProperties )

trong đó newProperties là một đối tượng của các đối tượng xác định từng thuộc tính.

Thí dụ:

const animal = {} const dog = Object. create ( animal , { breed : { value : ‘Siberian Husky’ } }); console . log ( dog . breed ) //’Siberian Husky’

Tôi không chỉ nói breed: ‘Siberian Husky’ nhưng tôi phải chuyển một đối tượng mô tả thuộc tính, được xác định ở đầu trang này.

Object.create() thường được sử dụng kết hợp với Object.assign() :

const dog = Object. assign (Object. create ( animal ), { bark () { console . log ( ‘bark’ ) } })

Tải xuống miễn phí của tôiSổ tay dành cho Người mới bắt đầu JavaScript

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JavaScript Objects

JavaScript Objects

In JavaScript, objects are king. If you understand objects, you understand JavaScript.

In JavaScript, almost “everything” is an object.

Booleans can be objects (if defined with the new keyword)

keyword) Numbers can be objects (if defined with the new keyword)

keyword) Strings can be objects (if defined with the new keyword)

keyword) Dates are always objects

Maths are always objects

Regular expressions are always objects

Arrays are always objects

Functions are always objects

Objects are always objects

All JavaScript values, except primitives, are objects.

JavaScript Primitives

A primitive value is a value that has no properties or methods.

3.14 is a primitive value

A primitive data type is data that has a primitive value.

JavaScript defines 7 types of primitive data types:

Examples

string

number

boolean

null

undefined

symbol

bigint

Immutable Primitive values are immutable (they are hardcoded and cannot be changed). if x = 3.14, you can change the value of x, but you cannot change the value of 3.14.

Value Type Comment “Hello” string “Hello” is always “Hello” 3.14 number 3.14 is always 3.14 true boolean true is always true false boolean false is always false null null (object) null is always null undefined undefined undefined is always undefined

Objects are Variables

JavaScript variables can contain single values:

Example let person = “John Doe”; Try it Yourself »

JavaScript variables can also contain many values.

Objects are variables too. But objects can contain many values.

Object values are written as name : value pairs (name and value separated by a colon).

Example let person = {firstName:”John”, lastName:”Doe”, age:50, eyeColor:”blue”}; Try it Yourself »

A JavaScript object is a collection of named values

It is a common practice to declare objects with the const keyword.

Example const person = {firstName:”John”, lastName:”Doe”, age:50, eyeColor:”blue”}; Try it Yourself »

Object Properties

The named values, in JavaScript objects, are called properties.

Property Value firstName John lastName Doe age 50 eyeColor blue

Objects written as name value pairs are similar to:

Associative arrays in PHP

Dictionaries in Python

Hash tables in C

Hash maps in Java

Hashes in Ruby and Perl

Object Methods

Methods are actions that can be performed on objects.

Object properties can be both primitive values, other objects, and functions.

An object method is an object property containing a function definition.

Property Value firstName John lastName Doe age 50 eyeColor blue fullName function() {return this.firstName + ” ” + this.lastName;}

JavaScript objects are containers for named values, called properties and methods.

You will learn more about methods in the next chapters.

Creating a JavaScript Object

With JavaScript, you can define and create your own objects.

There are different ways to create new objects:

Create a single object, using an object literal.

Create a single object, with the keyword new .

. Define an object constructor, and then create objects of the constructed type.

Create an object using Object.create() .

Using an Object Literal

This is the easiest way to create a JavaScript Object.

Using an object literal, you both define and create an object in one statement.

An object literal is a list of name:value pairs (like age:50) inside curly braces {}.

The following example creates a new JavaScript object with four properties:

Example const person = {firstName:”John”, lastName:”Doe”, age:50, eyeColor:”blue”}; Try it Yourself »

Spaces and line breaks are not important. An object definition can span multiple lines:

Example const person = {

firstName: “John”,

lastName: “Doe”,

age: 50,

eyeColor: “blue”

}; Try it Yourself »

This example creates an empty JavaScript object, and then adds 4 properties:

Example const person = {};

person.firstName = “John”;

person.lastName = “Doe”;

person.age = 50;

person.eyeColor = “blue”; Try it Yourself »

Using the JavaScript Keyword new

The following example create a new JavaScript object using new Object() , and then adds 4 properties:

Example const person = new Object();

person.firstName = “John”;

person.lastName = “Doe”;

person.age = 50;

person.eyeColor = “blue”; Try it Yourself »

The examples above do exactly the same. But there is no need to use new Object() . For readability, simplicity and execution speed, use the object literal method.

JavaScript Objects are Mutable

Objects are mutable: They are addressed by reference, not by value.

If person is an object, the following statement will not create a copy of person:

const x = person; // Will not create a copy of person.

The object x is not a copy of person. It is person. Both x and person are the same object.

Any changes to x will also change person, because x and person are the same object.

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Object.create() – JavaScript

Phương thức đối tượng create ()

JavaScript Objects

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