shorten long numbers to K/M/B jquery code example

Example 1: format number thousands k javascript

function nFormatter(num, digits) {
  var 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" }
  ];
  var rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
  var 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;
}

/*
 * Tests
 */
var tests = [
  { num: 1234, digits: 1 },
  { num: 100000000, digits: 1 },
  { num: 299792458, digits: 1 },
  { num: 759878, digits: 1 },
  { num: 759878, digits: 0 },
  { num: 123, digits: 1 },
  { num: 123.456, digits: 1 },
  { num: 123.456, digits: 2 },
  { num: 123.456, digits: 4 }
];
var i;
for (i = 0; i < tests.length; i++) {
  console.log("nFormatter(" + tests[i].num + ", " + tests[i].digits + ") = " + nFormatter(tests[i].num, tests[i].digits));
}

Example 2: javascript convert number from thousands to k and millions to m

// converts number to string representation with K and M.
// toFixed(d) returns a string that has exactly 'd' digits
// after the decimal place, rounding if necessary.
function numFormatter(num) {
    if(num > 999 && num < 1000000){
        return (num/1000).toFixed(1) + 'K'; // convert to K for number from > 1000 < 1 million 
    }else if(num > 1000000){
        return (num/1000000).toFixed(1) + 'M'; // convert to M for number from > 1 million 
    }else if(num < 900){
        return num; // if value < 1000, nothing to do
    }
}