export default (num:number, digits:number = 1):string => {
  const lookup = [
    { 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+$|(\.[0-9]*[1-9])0+$/;
  var item = lookup.slice().reverse().find(function(item) {
    return num >= item.value;
  });
  return item ? (num / item.value).toLocaleString(lang.region,{maximumFractionDigits:digits}).replace(rx, "$1") + item.symbol : "0";
}