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.toLocaleString, one of the most underrated JavaScript features

Siddharth on April 24, 2022

.toLocaleString and friends are some of the most underrated features of JavaScript. I came over them through a few different wanderings through MDN...

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JoelBonetR 🥇 • Apr 24 '22

Not only in JS, there are bugs in some games due to forgetting about this when dealing with dates in C# in Unity and so on 😆

Siddharth • Apr 25 '22

Haha, dates are a pain

Marcel Birkenkamp • Apr 28 '22

Blain is a Pain

JoelBonetR 🥇 • May 2 '22 • Edited

No Pain no Blain 💪🏼😂

Eiyad Z. • Apr 25 '22

I have used it for dates before, but really didn’t realize that I can do all of this ☺️

Great Article! 👏🏻👏🏻

Oluwapelumi Odumosu • Apr 29 '22 • Edited

My mind is blown, I've used it a ton of times for date formatting but didn't even know it had some more properties for dates! And that it can also be used for numbers 🤯.
I'm definitely trying this out.
Thanks for this piece.

busyxiang • Apr 25 '22

Didn't even realise you can do all this, thank you for the sharing

Rishi U • Apr 28 '22

awesome, why the .. for some items and not others?

Siddharth • Apr 29 '22 • Edited

In JavaScript, you can't directly access properties on numbers. You can either use 2 dots or braces instead

10.toString() // error
(10).toString() // ok
10..toString() // ok

venkatesanmca008 • Apr 28 '22

good one ..

Mohamed Achaq • Apr 24 '22

I'm using this feature a lot when displaying dates !

Augusto Peres • Apr 27 '22

MIND BLOWN! I’ll use it for sure!! Thanks!!

Thomas Bnt • Apr 24 '22

Good post and useful feature 👌

Siddharth • Apr 25 '22

Thanks!

Elaine Delgado • Apr 28 '22

Thanks, that helped a lot!!
Goodbye libraries for number formatting! =D

Arun Agnihotri • Apr 28 '22

I used it for dates only but very basic only. Didn't know all this was possible.
Thanks Siddharth!!

Yash Desai • May 2 '22

Thanks for sharing 👍

Amir-cahyadi • Apr 25 '22

Nice 👍

Mateusz Skrobiś • Apr 26 '22

I didn't know about that - WOW! this is awesome :) thank u very much for this article!

Frodo • May 20 '22

Thank you.

onedamianocoder • Apr 28 '22

clear explanation ! :)

Faleye Oluwafemi Joseph • Apr 28 '22

Exactly what I need at the moment. Thank you so much.

Siddharth • Apr 29 '22

Was that pun intended 🤣

Lioness100 • Apr 30 '22

What are the differences between Number#toString() and Intl.NumberFormat?

Siddharth • May 2 '22

.toString doesn't provide the features of Intl. It only supports stringifying to a base.

Lioness100 • May 16 '22 • Edited

Sorry, I meant .toLocaleString()

Siddharth • Jun 30 '22

The features are the same, except Intl is faster when you need to run the stringification multiple times

Lioness100 • Jun 30 '22

Ah, thanks!