JavaScript - Formating a long integer

Question

How can I take a JavaScript integer of arbitrary length, such as 1234567890, and format it as a string "1,234,567,890"?

score 2 · Answer 1 · answered Dec 12 '14 at 15:53

2

You can use toLocaleString() for the format that you have asked.

var myNum = 1234567890;
var formattedNum = myNum.toLocaleString();

answered Dec 12 '14 at 15:53

kameswarib

133
7

2

Good point, but [browser support is limited](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString#Browser_compatibility) – Travis Dec 12 '14 at 15:57

lante · Answer 2 · 2014-12-12T15:53:35.670

0

My solution:

var number = 1234567890;
var str = number + "";
var result = str.split('').map(function (a, i) { 
    if ((i - str.length) % 3 === 0 && i !== 0) { 
        return ',' + a;
    } else { 
        return a;
    } 
}).join('');

See fiddle.

edited Dec 12 '14 at 15:53

answered Dec 12 '14 at 15:48

lante

7,192
4
37
57

score 0 · Answer 3 · edited May 23 '17 at 10:26

0

The best way is probably with a regular expression. From How to print a number with commas as thousands separators in JavaScript:

function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

edited May 23 '17 at 10:26

Community

1
1

answered Dec 12 '14 at 15:49

Travis

1,463
11
12

If an existing answer solves a question, it should be marked as duplicate. – Felix Kling Dec 12 '14 at 15:58

JavaScript - Formating a long integer

3 Answers3