Scale

scale.js

//scale returns the number scaled to its corresponding SI suffix.
//  scale(1234) => "1.2 K"
//MIT License, Copyright jpillora © 2019
function scale(n, d) {
  // set default number
  if (typeof n !== "number" || isNaN(n)) n = 0;
  if (n === 0) return "0";
  // set default digit count
  if (typeof d !== "number" || isNaN(d)) d = 1;
  // find scale index 1000,100000,... becomes 1,2,...
  var i = Math.floor(Math.floor(Math.log10(n)) / 3);
  var f = Math.pow(10, d);
  var s = Math.round(n / Math.pow(10, i * 3) * f) / f;
  // concat (no trailing 0s) and choose scale letter
  return (
    s.toString().replace(/\.0+$/, "") +
    " " +
    ["", "K", "M", "G", "T", "P", "Z"][i]
  );
}