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    <p>There is a javascript port of the PHP function "number_format".</p> <p>I find it very usefull as it is easy to use and recognisable for PHP developers.</p> <pre><code>function number_format (number, decimals, dec_point, thousands_sep) { var n = number, prec = decimals; var toFixedFix = function (n,prec) { var k = Math.pow(10,prec); return (Math.round(n*k)/k).toString(); }; n = !isFinite(+n) ? 0 : +n; prec = !isFinite(+prec) ? 0 : Math.abs(prec); var sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep; var dec = (typeof dec_point === 'undefined') ? '.' : dec_point; var s = (prec &gt; 0) ? toFixedFix(n, prec) : toFixedFix(Math.round(n), prec); //fix for IE parseFloat(0.55).toFixed(0) = 0; var abs = toFixedFix(Math.abs(n), prec); var _, i; if (abs &gt;= 1000) { _ = abs.split(/\D/); i = _[0].length % 3 || 3; _[0] = s.slice(0,i + (n &lt; 0)) + _[0].slice(i).replace(/(\d{3})/g, sep+'$1'); s = _.join(dec); } else { s = s.replace('.', dec); } var decPos = s.indexOf(dec); if (prec &gt;= 1 &amp;&amp; decPos !== -1 &amp;&amp; (s.length-decPos-1) &lt; prec) { s += new Array(prec-(s.length-decPos-1)).join(0)+'0'; } else if (prec &gt;= 1 &amp;&amp; decPos === -1) { s += dec+new Array(prec).join(0)+'0'; } return s; } </code></pre> <p>(Comment block from <a href="http://kevin.vanzonneveld.net/techblog/article/javascript_equivalent_for_phps_number_format/" rel="noreferrer">the original</a>, included below for examples &amp; credit where due)</p> <pre><code>// Formats a number with grouped thousands // // version: 906.1806 // discuss at: http://phpjs.org/functions/number_format // + 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) // * 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' </code></pre>
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