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'use strict';

module.exports = function number_format(number, decimals, decPoint, thousandsSep) {
  // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/number_format/
  // original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  // improved by: Kevin van Zonneveld (http://kvz.io)
  // improved by: davook
  // improved by: Brett Zamir (http://brett-zamir.me)
  // improved by: Brett Zamir (http://brett-zamir.me)
  // improved by: Theriault (https://github.com/Theriault)
  // improved by: Kevin van Zonneveld (http://kvz.io)
  // bugfixed by: Michael White (http://getsprink.com)
  // bugfixed by: Benjamin Lupton
  // bugfixed by: Allan Jensen (http://www.winternet.no)
  // bugfixed by: Howard Yeend
  // bugfixed by: Diogo Resende
  // bugfixed by: Rival
  // bugfixed by: Brett Zamir (http://brett-zamir.me)
  //  revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  //  revised by: Luke Smith (http://lucassmith.name)
  //    input by: Kheang Hok Chin (http://www.distantia.ca/)
  //    input by: Jay Klehr
  //    input by: Amir Habibi (http://www.residence-mixte.com/)
  //    input by: Amirouche
  //   example 1: number_format(1234.56)
  //   returns 1: '1,235'
  //   example 2: number_format(1234.56, 2, ',', ' ')
  //   returns 2: '1 234,56'
  //   example 3: number_format(1234.5678, 2, '.', '')
  //   returns 3: '1234.57'
  //   example 4: number_format(67, 2, ',', '.')
  //   returns 4: '67,00'
  //   example 5: number_format(1000)
  //   returns 5: '1,000'
  //   example 6: number_format(67.311, 2)
  //   returns 6: '67.31'
  //   example 7: number_format(1000.55, 1)
  //   returns 7: '1,000.6'
  //   example 8: number_format(67000, 5, ',', '.')
  //   returns 8: '67.000,00000'
  //   example 9: number_format(0.9, 0)
  //   returns 9: '1'
  //  example 10: number_format('1.20', 2)
  //  returns 10: '1.20'
  //  example 11: number_format('1.20', 4)
  //  returns 11: '1.2000'
  //  example 12: number_format('1.2000', 3)
  //  returns 12: '1.200'
  //  example 13: number_format('1 000,50', 2, '.', ' ')
  //  returns 13: '100 050.00'
  //  example 14: number_format(1e-8, 8, '.', '')
  //  returns 14: '0.00000001'

  number = (number + '').replace(/[^0-9+\-Ee.]/g, '');
  var n = !isFinite(+number) ? 0 : +number;
  var prec = !isFinite(+decimals) ? 0 : Math.abs(decimals);
  var sep = typeof thousandsSep === 'undefined' ? ',' : thousandsSep;
  var dec = typeof decPoint === 'undefined' ? '.' : decPoint;
  var s = '';

  var toFixedFix = function toFixedFix(n, prec) {
    var k = Math.pow(10, prec);
    return '' + (Math.round(n * k) / k).toFixed(prec);
  };

  // @todo: for IE parseFloat(0.55).toFixed(0) = 0;
  s = (prec ? toFixedFix(n, prec) : '' + 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);
};
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