bbo/number_format.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

/**
 * https://locutus.io/php/
 */
// eslint-disable-next-line max-params
var numberFormat = (number, decimals, decPoint, thousandsSep) => {
  var _number = String(number).replace(/[^0-9+\-Ee.]/g, '');

  var _decimals = decimals;
  var n = !isFinite(Number(_number)) ? 0 : Number(_number);
  var prec = !isFinite(Number(_decimals)) ? 0 : Math.abs(_decimals);
  var sep = typeof thousandsSep === 'undefined' ? ',' : thousandsSep;
  var dec = typeof decPoint === 'undefined' ? '.' : decPoint;
  var s = '';

  var toFixedFix = function (n, prec) {
    if (String(n).indexOf('e') === -1) {
      return Number(Math.round(n + 'e+' + prec) + 'e-' + prec);
    } else {
      var arr = String(n).split('e');
      var sig = '';

      if (Number(arr[1]) + prec > 0) {
        sig = '+';
      }

      return Number(Math.round(Number(arr[0]) + 'e' + sig + (Number(arr[1]) + prec)) + 'e-' + prec).toFixed(prec);
    }
  }; // @todo: for IE parseFloat(0.55).toFixed(0) = 0;


  s = (prec ? toFixedFix(n, prec).toString() : String(Math.round(n))).split('.');

  if (s[0].length > 3) {
    s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep);
  }

  if ((s[1] || '').length < prec) {
    s[1] = s[1] || '';
    s[1] += new Array(prec - s[1].length + 1).join('0');
  }

  return s.join(dec);
};

module.exports = numberFormat;