Question

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how to print number with commas as thousands separators in Javascript

I have a function that will add thousand seperators to a number, however it is not working well when a decimal is passed in:

function thousandSep(val) {
        return String(val).split("").reverse().join("")
                      .replace(/(.{3}\B)/g, "$1,")
                      .split("").reverse().join("");
    }

If I pass in 10000, I get 10,000 as expected.

However, passing in 10,000.00 I get 1,000,0.00.

How can I modify the function to handle decimals?

Answer 1

Don’t use ., use \d

function thousandSep(val) {
    return String(val).split("").reverse().join("")
                  .replace(/(\d{3}\B)/g, "$1,")
                  .split("").reverse().join("");
}