Number with commas (JS/TS)

numberWithCommas.ts

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

function toLocaleStringSupportsLocales(number: number | string) {
  if (typeof number === "string") {
    return parseFloat(number).toLocaleString();
  }
  return number.toLocaleString();
}

console.log(numberWithCommas(123456789));
console.log(numberWithCommas(123_456_789));
console.log(numberWithCommas(123_456_789.0234242));
console.log(numberWithCommas(0.123456789));
console.log(toLocaleStringSupportsLocales(0));
console.log(toLocaleStringSupportsLocales(0.0000001));
console.log(toLocaleStringSupportsLocales("000"));
console.log(toLocaleStringSupportsLocales(123456_789));
console.log(toLocaleStringSupportsLocales(123456_789.123123123123));
console.log(toLocaleStringSupportsLocales(1_2345.678_9));
console.log(toLocaleStringSupportsLocales("1,234.56789"));