Large currency / money number formatter

nFormatter.js

// https://tinyurl.com/nFormatter
export const nFormatter = (num: number, digits: number) => {
  const si = [
    { value: 1, symbol: "" },
    { value: 1E3, symbol: "k" },
    { value: 1E6, symbol: "M" },
    { value: 1E9, symbol: "G" },
    { value: 1E12, symbol: "T" },
    { value: 1E15, symbol: "P" },
    { value: 1E18, symbol: "E" }
  ];

  const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
  let i;

  for (i = si.length - 1; i > 0; i--) {
    if (num >= si[i].value) {
      break;
    }
  }

  return (num / si[i].value).toFixed(digits).replace(rx, "$1") + si[i].symbol;
}


/*
nFormatter(100000000, 1) = 100M
nFormatter(299792458, 1) = 299.8M
*/