Skip to main content

Javascript/Node.js: 2 Features that you might not know.


This is a very short article where we will be discussing two Javascript features that you may not know.
Also, you may like this article about two new Node.js features.  

So let's start,

1)Exponentiation operator(**):
This operator was added in ES6 and is supported by most of the browsers but excluding internet explorer.
It is also called an Infix operator for Exponentiation.
Before for exponentiation, we have to use Math.pow(x,y).
But now you can use x**y.

For example: 2**5 //returns 32

2)Numeric Separators:
Large numeric literals are difficult for the human eye to parse quickly,
especially when there are lots of repeating digits. To improve readability, you can use
underscores as separators in numeric literals.

For example:
let value= 100_000_000_00 //Is same as 10000000000

As of May 2020, It is supported by all major browsers (Chrome[75+], Firefox[70+], Edge, Safari[13+], Opera) (source 1, source 2 for more details about different browsers and versions supporting it) 
And if you're working on the server-side, Node.js v12.5.0 is already supporting it as well. 
Interesting note: although supported by all browsers, this is not part of any ECMAScript version yet.


I hope you like this article and if any doubts please let me know in the comment section.

Subscribe this blog for more articles on Node.js and JavaScript.
You can also follow me on Twitter or Linkedin for the latest updates.

Written By:
Saurabh Joshi






Comments

Post a Comment

Popular posts from this blog

Node.js: Extract text from image using Tesseract.

In this article, we will see how to extract text from images using Tesseract . So let's start with this use-case, Suppose you have 300 screenshot images in your mobile which has an email attribute that you need for some reason like growing your network or for email marketing. To get an email from all these images manually into CSV or excel will take a lot of time. So now we will check how to automate this thing. First, you need to install Tesseract OCR( An optical character recognition engine ) pre-built binary package for a particular OS. I have tested it for Windows 10. For Windows 10, you can install  it from here. For other OS you make check  this link. So once you install Tesseract from windows setup, you also need to set path variable probably, 'C:\Program Files\Tesseract-OCR' to access it from any location. Then you need to install textract library from npm. To read the path of these 300 images we can select all images and can rename it to som...
1 comment
Read more

Globant part 1

 1)call,apply,bind example? Ans: a. call Method: The call method is used to call a function with a given this value and arguments provided individually. Javascript code: function greet(name) {   console.log(`Hello, ${name}! I am ${this.role}.`); } const person = {   role: 'developer' }; greet.call(person, 'Alice'); // Output: Hello, Alice! I am developer. In this example, call invokes the greet function with person as the this value and passes 'Alice' as an argument. b. apply Method: The apply method is similar to call, but it accepts arguments as an array. Javascript code: function introduce(language1, language2) {   console.log(`I can code in ${language1} and ${language2}. I am ${this.name}.`); } const coder = {   name: 'Bob' }; introduce.apply(coder, ['JavaScript', 'Python']); // Output: I can code in JavaScript and Python. I am Bob. Here, apply is used to invoke introduce with coder as this and an array ['JavaScript', 'Pyt...
Post a Comment
Read more

Globlant part 2

 1)JWT token:           const jwt = require ( 'jsonwebtoken' ); A JWT token consists of three parts separated by dots ( . ): Header : Contains metadata about the type of token and the hashing algorithm used. Payload (Claims) : Contains the claims or statements about the subject of the token, such as user ID, roles, etc. Signature : Verifies that the sender of the JWT is who it says it is and ensures that the message wasn't changed along the way. It is header +payload +secret key. Methods: const newToken = jwt. sign (payload, secretKey, { expiresIn : '1h' }); Use verify() when you need to ensure the token's integrity and authenticity. Use decode() when you only need to extract information from the token and don't need to verify its signature. 2)Window ,this,global: In nodejs this and global refers to same global methods and varibales just that no dom related things that are in window. In nodejs no window. 3)a.getSum(); // Define the custom method getSu...
Post a Comment
Read more