Javascript Commarization

commarize.js

// From https://gist.github.com/MartinMuzatko/1060fe584d17c7b9ca6e

const commarize = (n) => {
  if (n >= 1e3) {
    const units = [" thousand", " million", " billion", " trillion"];
    let unit = Math.floor((n.toFixed(0).length - 1) / 3) * 3;
    const num = (n / ("1e" + unit)).toFixed(2);
    const unitname = units[Math.floor(unit / 3) - 1];
    return num + unitname;
  }
  return n.toLocaleString();
};

// commarize(123456789); => "123.46 million"