Nodejs Utililty Methods Number to Readable Format

Number.toHumanSize = function(bytes) {
  var labels = ['Bytes', 'kB', 'MB', 'GB', 'TB'];
  if (bytes === 0) {
    return 'n/a';
  var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
  return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + labels[i];
};

Number.toHumanTime = function(elapsed) {
  var labels = ['ms', 's', 'm', 'h', 'd'];
  var sizes = [1000, 60, 60, 24];
  var data = [];
  sizes.forEach(function(value) {
    data.push(elapsed % value);
    elapsed = parseInt(elapsed / value);
  });
  var pos = 0;
...

Number.prototype.humanReadableOrder = function() {
  if (this>=1000000000) {
    return (this/1000000000).toFixed(1)+'b';
  if (this>=1000000) {
    return (this/1000000).toFixed(1)+'m';
  if (this>=1000) {
    return (this/1000).toFixed(1)+'k';
...

Number.prototype.humanReadablePrice = function() {
  return (this/10000).toFixed(2);
};

var numbersToWords = {
  0: 'zero',
  1: 'one',
  2: 'two',
  3: 'three',
  4: 'four',
  5: 'five',
  6: 'six',
  7: 'seven',
...

var numbersToWords = {
  0: 'zero',
  1: 'one',
  2: 'two',
  3: 'three',
  4: 'four',
  5: 'five',
  6: 'six',
  7: 'seven',
...

Number.prototype.to_kilometers = function() {
  return this / 1000.0;
};

Number.prototype.to_kilometers_per_hour = function() {
  return this / 1000.0 * 3600.0;
};

Number.prototype.to_miles = function() {
  return this / 1609.344;
};

Number.prototype.to_miles_per_hour = function() {
  return this / 1609.344 * 3600.0;
};