how to add a coma between numbers in javascript code example

Example 1: add comma to number javascript

var n = 34523453.345
n.toLocaleString()
"34,523,453.345"

Example 2: javascript friendly number format with commas

//ES6 Way
const numberWithCommas = (x) => {
  return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}