Numeric Separator In JavaScript

Hello Devs,

In this article let's discuss about one of the most amazing features introduced in ECMAScript21 (12th edition) i.e., Numeric Separator.

Table of content

1. Introduction
2. Some Examples
3. Conclusion

1. Introduction

This feature enables developers to make the numeric literals more readable.
What I mean to say is, large numeric literals (both integers and floating-point) which are difficult for the human eye to parse quickly, especially when there are long digit repetitions, this feature of ES12 makes it simple to read.

How?

Please read this number

let num = 1000000000000

if someone is reading the value of num verbally, then in the first sight one cannot be able to read it. So numeric separator help developers make it readable in the first sight.

Let's see how it helps.

Now, read this number

let num = 100_000_000_000 

Did you found it little easier to read than the first one? If YES let me know.

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2. Examples

Let see some examples,

1. equality & strict equality

let num1 = 1000000000000 
let num2 = 100_000_000_000

console.log(num1==num2) //true
console.log(num1===num2) //true

1. What is the output in console for number with underscore in it?

let num = 100_000_000_000
console.log(num) //100000000

1. We can use underscore with Binary, Octal, Hex numbers are well

let num1 = 0b1010_0101_1001 // binary
let num2 = 0o2_3_5_7 // octal
let num3 = 0xA_B_C_D_E // hex

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3. Conclusion

Awesome! Now you have learnt 1 new feature of JavaScript, I hope you have now a very clear idea regarding underscore between digits in numeric literals.

Thank you for reading this far. This is a brief introduction of Numeric Separator In JavaScript.

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Hope it's a nice and informative read for you.
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Thanks,
CapsCode