`function number_format(number, decimals, dec_point, thousands_sep) {// http://kevin.vanzonneveld.net// + original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)// + bugfix by: Michael White (http://getsprink.com)// + bugfix by: Benjamin Lupton// + bugfix by: Allan Jensen (http://www.winternet.no)// + revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)// + bugfix by: Howard Yeend// + revised by: Luke Smith (http://lucassmith.name)// + bugfix by: Diogo Resende// + bugfix by: Rival// + input by: Kheang Hok Chin (http://www.distantia.ca/)// + improved by: davook// + improved by: Brett Zamir (http://brett-zamir.me)// + input by: Jay Klehr// + improved by: Brett Zamir (http://brett-zamir.me)// + input by: Amir Habibi (http://www.residence-mixte.com/)// + bugfix by: Brett Zamir (http://brett-zamir.me)// + improved by: Theriault// + improved by: Drew Noakes// * 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'var n=!isFinite(+number) ? 0 : +number, prec=!isFinite(+decimals) ? 0 : Math.abs(decimals),sep=(typeof thousands_sep==='undefined') ? ',' : thousands_sep,dec=(typeof dec_point==='undefined') ? '.' : dec_point,toFixedFix=function (n, prec) {// Fix for IE parseFloat(0.55).toFixed(0)=0;var k=Math.pow(10, prec);return Math.round(n * k) / k;},s=(prec ? toFixedFix(n, prec) : Math.round(n)).toString().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);}var exampleNumber=1;function test(expected, number, decimals, dec_point, thousands_sep){var actual=number_format(number, decimals, dec_point, thousands_sep);console.log('Test case ' + exampleNumber + ': ' +'(decimals: ' + (typeof decimals==='undefined' ? '(default)' : decimals) +', dec_point: "' + (typeof dec_point==='undefined' ? '(default)' : dec_point) + '"' +', thousands_sep: "' + (typeof thousands_sep==='undefined' ? '(default)' : thousands_sep) + '")');console.log('=> ' + (actual===expected ? 'Passed' : 'FAILED') + ', got "' + actual + '", expected "' + expected + '".');exampleNumber++;}test('1,235', 1234.56);test('1 234,56', 1234.56, 2, ',', ' ');test('1234.57', 1234.5678, 2, '.', '');test('67,00', 67, 2, ',', '.');test('1,000', 1000);test('67.31', 67.311, 2);test('1,000.6', 1000.55, 1);test('67.000,00000', 67000, 5, ',', '.');test('1', 0.9, 0);test('1.20', '1.20', 2);test('1.2000', '1.20', 4);test('1.200', '1.2000', 3);`

`.as-console-wrapper {max-height: 100% !important;}`

`Number.prototype.toLocaleString`

stilldoes not work in Safari, in2016. Instead of actually formatting the number, it just returns it, no error thrown. Having the biggest facepalm today as a result of that... #goodworkApple– aendrewMar 10 '16 at 11:21