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    <h2>Short and fast solution (works everywhere!)</h2> <pre><code>(12345.67).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&amp;,'); // 12,345.67 </code></pre> <p>The idea behind this solution is replacing matched sections with first match and comma, i.e. <code>'$&amp;,'</code>. The matching is done using <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#special-lookahead" rel="noreferrer">lookahead approach</a>. You may read the expression as <em>"match a number if it is followed by a sequence of three number sets (one or more) and a dot"</em>.</p> <p><strong>TESTS:</strong></p> <pre><code>1 --&gt; "1.00" 12 --&gt; "12.00" 123 --&gt; "123.00" 1234 --&gt; "1,234.00" 12345 --&gt; "12,345.00" 123456 --&gt; "123,456.00" 1234567 --&gt; "1,234,567.00" 12345.67 --&gt; "12,345.67" </code></pre> <p><strong>DEMO:</strong> <a href="http://jsfiddle.net/hAfMM/9571/" rel="noreferrer">http://jsfiddle.net/hAfMM/9571/</a></p> <hr> <h2>Extended short solution</h2> <p>You can also extend the prototype of <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Number" rel="noreferrer"><code>Number</code></a> object to add additional support of any number of decimals <code>[0 .. n]</code> and the size of number groups <code>[0 .. x]</code>:</p> <pre><code>/** * Number.prototype.format(n, x) * * @param integer n: length of decimal * @param integer x: length of sections */ Number.prototype.format = function(n, x) { var re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n &gt; 0 ? '\\.' : '$') + ')'; return this.toFixed(Math.max(0, ~~n)).replace(new RegExp(re, 'g'), '$&amp;,'); }; 1234..format(); // "1,234" 12345..format(2); // "12,345.00" 123456.7.format(3, 2); // "12,34,56.700" 123456.789.format(2, 4); // "12,3456.79" </code></pre> <p><strong>DEMO / TESTS:</strong> <a href="http://jsfiddle.net/hAfMM/435/" rel="noreferrer">http://jsfiddle.net/hAfMM/435/</a></p> <hr> <h2>Super extended short solution</h2> <p>In this <a href="https://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript/14428340#comment34151293_14428340">super extended version</a> you may set different delimiter types:</p> <pre><code>/** * Number.prototype.format(n, x, s, c) * * @param integer n: length of decimal * @param integer x: length of whole part * @param mixed s: sections delimiter * @param mixed c: decimal delimiter */ Number.prototype.format = function(n, x, s, c) { var re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n &gt; 0 ? '\\D' : '$') + ')', num = this.toFixed(Math.max(0, ~~n)); return (c ? num.replace('.', c) : num).replace(new RegExp(re, 'g'), '$&amp;' + (s || ',')); }; 12345678.9.format(2, 3, '.', ','); // "12.345.678,90" 123456.789.format(4, 4, ' ', ':'); // "12 3456:7890" 12345678.9.format(0, 3, '-'); // "12-345-679" </code></pre> <p><strong>DEMO / TESTS:</strong> <a href="http://jsfiddle.net/hAfMM/612/" rel="noreferrer">http://jsfiddle.net/hAfMM/612/</a></p>
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    1. POHow can I format numbers as dollars currency string in JavaScript?
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    1. COI actually went a step further: `.replace(/(\d)(?=(\d{3})+(?:\.\d+)?$)/g, "$1,")`.
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    2. COCoffeeScript version with of VisioN & kalisjoshua regexp and way of specifying decimal place (so you can leave the default of 2 or specify 0 for no decimal): `Number.prototype.toMoney = (decimal=2) -> @toFixed(decimal).replace /(\d)(?=(\d{3})+(?:\.\d+)?$)/g, "$1,"`
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    3. COIf we call toFixed(0), the commas disappear, any idea on getting it to work with `this.toFixed(0).replace(/(\d)(?=(\d{3})+\.)/g, "$1,")`?
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