Shubham Ankit

Shubham Ankit


How to Use Destructuring in JavaScript

Destructuring applies to arrays and objects. It consists in breaking down complex structures (array, object) to extract the values we are interested in. Those manipulations make the code simpler and easier to read.

let [ valeur1, valeur2 ] = tableau
let { valeur1, valeur2 } = objet

The syntax is different wether it is an array or an object.

Breaking Arrays Down

A concrete example of breaking arrays down is when you want to get values from an array.

let args = ['fruits', 'pomme', 'poire', 'abricot']
let type = args[0]
let firstEl = args[1]
let secondEl = args[2]
let thirdEl = args[3]

Without destructuring, here is how we can get the values from an array to use them.

let args = ['fruits', 'pomme', 'poire', 'abricot']
let [type, firstEl, secondEl, thirdEl] = args

Same thing with destructuring.

The two bits of code are similar, the result is the same. In each case, the variable typefirstElsecondElthirdEl are created.

If we stop here, this syntax has not a great interest except sparing us three lines of code. But destructuring has a lot more in store that will make you time efficient.

We will not compare with examples without destructuring each time but try to think of how you would have code the same feature without destructuring.

Example : If I only want to get the type and the second element back.

let args = ['fruits', 'pomme', 'poire', 'abricot']
let [type,, secondEl] = args

You just have to add a coma between args[0] and args[2] without specifying the variable name of args[1].

Example : If args is empty, my variables type and secondEl will be created but will have undefined as value. To be able to continue working with it, I would have to test my variables. But I can also assign them default values.

let args = []
let [type = 'legume', firstEl = 'salade'] = args

As args is empty, type will have “légume” as value and firstEl will have “salade” as value.

Example :  If I want to get back to the type of my elements in a variable, but it would be easier for me to have the list of elements in an array to loop on.

let args = ['fruits', 'pomme', 'poire', 'abricot']
let [type, ...elements] = args

Here type will have “fruits” as value and elements will have ['pomme', 'poire', 'abricot'].

The syntax here is quite particular because it uses what we call a rest paramater

You can also use destructuring in case you would not think about it usually :

Example : If I want to swap the values of two variables.

let valA = 'coucou'
let valB = 'byebye'
[valA, valB] = [valB, valA]

Logically valA will have “byebye” as a value and valB will have “coucou”.

Example : Destructuring can be used to work with functions that return arrays.

let [max, min] = getMaxAndMin([3, 34, 2, 5, 6, 22, 33, 1])

The interest here is the readability of the code. Of course, you will need to be sure of the order of the returned values by the used function.

Example : It is possible to use destructuring as function parameter.

function firstIsTrue([ first = false ]) {
  return first === true

firstIsTrue() take an array in parameter. Only the first value will be transmitted to the function and if the array is empty : first will have false as value.

For the function user, everything is transparent.

Destructuring Objects

Destructuring objects is quite similar to arrays with a few specificities. We will cover that quickly to stop on more interesting notions.

Example : Retrieval of one of our keys

let objet = {
  slug: 'test'
  title: 'Ceci est un test'
  content: '...'
  visible: true
let { title } = objet

Standard example where we only want the title. You will note that we use brackets instead of square brackets when it is an object.

Example : Default value

let objet = {
  slug: 'test'
  title: 'Ceci est un test'
  content: '...'
  visible: true
let { visible = false } = objet

You only want visibility and a false by default.

Example : Using an other name for a key

let objet = {
  slug: 'test'
  title: 'Ceci est un test'
  content: '...'
  visible: true
let { content: article } = objet

Here, we only retrieve the key content that we are stocking in the article variable.

The real syntax of destructuring is the one used in this example. In other examples, we used a tip from ES2015 that prevent us from writing the same thing twice when possible. Just remind that { visible: visible } is equal{ visible }.

Example : Accumulation of default value and name changing

let objet = {
  slug: 'test'
  title: 'Ceci est un test'
  content: '...'
  visible: true
let { visible: isVisible = false } = objet

We retrieve the key visible that we are stocking in the variable isVisible. This variable will be by default false.

Example : Using destructuring as function parameter

It is the case in which I use the most destructuring. It saves so much time.

You probably already wrote some function with an options parameter that gather all your options in an object.Think about all that wasted time and that number of lines you had to write to test this parameter before even coding business logic.

function test(id, { maxLength = 10, current = 0 } = {})

As for destructuring an array, using it in paramaters is absolutely transparent for users but it changes your whole life.

maxLength and current will never be undefined, will always have a value, either the users or the default one. It will lighten your code as you will not be doing options.maxLength anymore but just maxLength as if it was a simple parameter as id.

Only the attributes that you have declared in destructuring will be transmitted to your function. The user can add 15 000 other attributes to options, they will not be transmitted. It adds a bit of security to your function too.


I really hope I convinced you to try it. Destructuring is, for me, one of the biggest ES2015 new feature.

A powerful function to use without moderation to make your code simpler, clearer, beautiful, cleaner… And you know how I like clean code.

#javascript #web-development

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How to Use Destructuring in JavaScript
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Array Destructuring in JavaScript

Destructuring is a convenient way of extracting multiple values from data stored in objects and Arrays. ES6 introduced some significant improvements to the language, including the de-structuring of Objects and Arrays. Honestly speaking, these are my favorite edition in the JavaScript standard syntax.

Array destructuring

Let us take a look if we want to extract data from an array in es5.

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Here, we are doing something quite boring stuff and repeated the same thing again and again. But ES6 destructuring assignment makes it easier.

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We can also do this with the same result,

we can also declare variables before Assignment,

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Assign variables a default value:

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Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


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What Is The Use Of WordPress?

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WordPress Multisite allows you to develop multiple sites from a single WordPress installation. You can download WordPress and start building websites you want to launch under a single server. Literally speaking, you can handle hundreds of sites from one single dashboard, which now needs applause.
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WordPress can be used for high-end projects such as Social Media Network. If you don’t have the money and patience to hire a coder and invest months in building a feature-rich social media site, go for WordPress. It is one of the most amazing uses of WordPress. Its stunning CMS is unbeatable. And you can build sites as good as Facebook or Reddit etc. It can just make the process a lot easier.
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It is the best community development technology. If you want to build your online community, you need to consider all the amazing features you get with WordPress. Plugins such as BB Press is an open-source, template-driven PHP/ MySQL forum software. It is very simple and doesn’t hamper the experience of the website.
Other tools such as wpFoRo and Asgaros Forum are equally good for creating a community blog. They are lightweight tools that are easy to manage and integrate with your WordPress site easily. However, there is only one tiny problem; you need to have some technical knowledge to build a WordPress Community blog page.

4. Shortcodes
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6. Security Features
WordPress takes security very seriously. It offers tons of external solutions that help you in safeguarding your WordPress site. While there is no way to ensure 100% security, it provides regular updates with security patches and provides several plugins to help with backups, two-factor authorization, and more.
By choosing hosting providers like WP Engine, you can improve the security of the website. It helps in threat detection, manage patching and updates, and internal security audits for the customers, and so much more.

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