fnumber/index.js

A small number formatter.

'use strict';

function formatNumber(number, opts) {
  opts = opts || {};
  var round = opts.round || 0;
  var sectionsDelimiter = opts.sectionsDelimiter || ',';
  var decimal = opts.decimal || '.';

  var re = '\\d(?=(\\d{3})+' + (round > 0 ? '\\D' : '$') + ')';
  var num = Number(number).toFixed(~~round);

  return num.replace('.', decimal)
    .replace(new RegExp(re, 'g'), '$&' + sectionsDelimiter);
}

module.exports = formatNumber;