How to put symbol after each 3 numbers in Javascript?

Question

I'm struggling with putting a dot after each 3 numbers in JavaScript.

I know that it should be done using regex and I should use join method? But can someone please tell me how to implement that?

My idea for now is to do like that:

let num=12312;
let res=num.replace(/(.{3}/g,".");
console.log(res);

But that's not working. Thank you in advance!

Please add your best attempt as a runnable snippet reproducing your problem. Also try to be more precise on **exactly when** should **exactly what** happen. — connexo, May 09 '22 at 11:10
Are you trying to present the number with French style thousand separators? — Quentin, May 09 '22 at 11:11
@connexo — Good point, it would be every third from the right, not the left then, wouldn't it? — Quentin, May 09 '22 at 11:12

score -2 · Answer 1 · answered May 09 '22 at 11:12

-2

You can use toLocaleString to add comma after 3 number.

var x = 100000000;
console.log(x.toLocaleString('EN-US'))

answered May 09 '22 at 11:12

Rahul Sharma

Just curious, how did you manage post an answer to a closed question after it was closed? – vanowm May 09 '22 at 11:15
2

@vanowm https://meta.stackexchange.com/questions/91922/how-was-this-answer-posted-after-this-question-was-closed – adiga May 09 '22 at 11:16
1

Try that with `1000` instead of `100000000`. Your code puts the character **before** every third character from the **right**, not after every third character from the left. Also you picked a US locale so its the wrong character. It only works in your example because the number of digits in the number is divisible by three. – Quentin May 09 '22 at 11:17
@vanowm I was typing the answer. I didn't know It's closed. – Rahul Sharma May 09 '22 at 11:17

1 Answers1