Change the way you create an Object - Javascript Weekly

In this article, we will see different ways to create an object in javascript. Change the way you create an Object - Javascript Weekly

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Understanding Closures in Javascript

Currying in Javascript

Object plays an important role in javascript ecosystem. we as a javascript developers creates a lots of objects while writing code. we will see some different way to do that

Object as literal

this is a default way to create an object. creating an object with curly braces is the popular way in Object Creation

1const User = {
2  name: "John",
3  age: 25,
4}

object as literal allows to add the property to an object dynamically. For Example, if you want add a property to User object, you can do it like

1User.address = "Country"

In addition to that, you can also have a nested property inside the object literal

1const Company = {
2  name: "Test",
3  tax: {
4    id: "12345",
5  },
6}

"new" Operator

you can also create an object with key word new.

1function Document(name, category) {
2  this.name = name
3  this.category = category
4}
5
6let salarydocument = new Document("salary", "SALARY")
7
8let insurance = new Document("insurance", "INSURANCE")

main advantage of using new operator is, you can use prototype to chain methods. Prototype Chain is an important concept in using new keyword

1function Language(name, shortform) {
2  this.name = name
3  this.shortform = shortform
4}
5
6Language.prototype.getShortForm = function() {
7  return this.shortform
8}
9
10let english = new Language("english", "en")

Object.create() method

Object create method allows you to create an object from an existing one.

For Example, Let's say that you have an object Message, to create an Object with the same property as Message. you can do something like

1let Message = {
2  title: "Hola!",
3  body: "Welcome",
4}
5
6let greeting = Object.create(Message)
7
8console.log(greeting.title)

you can also add property to greeting object

1let Message = {
2  title: "Hola!",
3  body: "Welcome",
4}
5
6let greeting = Object.create(Message, {
7  type: {
8    writable: true,
9    enumerable: true,
10    configurable: false,
11    value: "Data",
12  },
13})
14
15console.log(greeting.type)

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Using ES6 Class

ES6 class is an another way to create objects in javascript

1class User {
2  constructor(name, age) {
3    this.name = name
4    this.age = age
5  }
6
7  getInfo() {
8    console.log(`Hey ${this.name} Age : ${this.age}`)
9  }
10}
11
12let admin = new User("admin", 40)
13
14admin.getInfo()