Best of Modern JavaScript — Destructuring

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at JavaScript destructuring.

Array Destructuring

We can destructure arrays into variables by their position.

For example, if we have:

const arr = ['a', 'b'];
const [x, y] = arr;

Then x is 'a' and y is 'b' .

Returned values are also processed.

For example, we can write:

const [all, areaCode, officeCode, number] =
/^(\d\d\d)-(\d\d\d)-(\d\d\d\d)$/
.exec('555-555-1212');

We destructure the matched patterns into their own variables.

exec returns an array with the whole string and the parts matched by patterns so we can assign to variables.

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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.

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

We can also do this with the same result,

we can also declare variables before Assignment,

Assign variables a default value:

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

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!");
</script>

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"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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