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POIs there a Money class for JavaScript?
 

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  1. POIs there a Money class for JavaScript?
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    <p><em>Disclaimer: complete rewrite for clarity as of 10/14/2011</em></p> <p><strong>Given</strong> the <code>number</code> primitive in JavaScript is an <a href="http://en.wikipedia.org/wiki/IEEE_754-2008" rel="nofollow noreferrer">IEEE 754</a> 64-bit floating point (<em>known in other languages as a double</em>), and <a href="https://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency">using floats to model currencies is a <strong>bad idea</strong></a>, <strong>is a Money prototype</strong> (JavaScript) <strong>or a <a href="http://rzrsharp.net/2011/06/21/classes-in-coffeescript.html" rel="nofollow noreferrer">Coffeescript Class</a></strong> that eases use of pseudo-integer cents and string <a href="http://en.wikipedia.org/wiki/ISO_4217" rel="nofollow noreferrer">currency ISO 4217 code</a> to represent currency <strong>available</strong>? </p> <p>^ There's still gotta be a better way to say that.</p> <p>I'm hoping to find something that mirrors the common design pattern of the many other languages out there that do include an integer primitive.</p> <p>As examples, I'm familiar with the <a href="http://rubygems.org/gems/money" rel="nofollow noreferrer">money gem</a> for ruby, and the <a href="http://pypi.python.org/pypi/python-money/0.5" rel="nofollow noreferrer">python-money</a> package, both of which implement variations of this design pattern.</p> <p>Ideally looking for something that will play nice with <a href="http://documentcloud.github.com/backbone/" rel="nofollow noreferrer">backbone.js</a> and <a href="http://nodejs.org/" rel="nofollow noreferrer">node.js</a>, but all suggestions appreciated.</p> <p><em>Edit 4</em>: As far as I can tell, as long as an implementation of <code>roundDownOrUp ? floor : ceiling</code> is called on the Number after every operation (&amp; in between chained operations) everything would function as if one were dealing with integers.</p> <hr> <h3>Old information, retained to document the history of the question.</h3> <p>I read <a href="https://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript">How can I format numbers as money in JavaScript?</a> where I found <a href="http://josscrowcroft.github.com/accounting.js/" rel="nofollow noreferrer">accounting.js</a> and <a href="http://wiki.jqueryui.com/w/page/39118647/Globalize" rel="nofollow noreferrer">jQuery Globalize</a> which both do pretty printing but are not designed to model currencies and perform operations with them.</p> <p><em>Edit 1</em>: Just found <a href="http://jsorm.com/wiki/Currency" rel="nofollow noreferrer">JSorm Currency</a> in the <a href="http://search.npmjs.org/#/jsorm-i18n" rel="nofollow noreferrer">npm registry</a> which is ISO 4217 aware, but does not appear to include any fixes for float "<em>gotchas</em>". Please correct if I have misread.</p> <p><em>Edit 2 folded into rewrite.</em></p> <p><em>Edit 3</em>: It looks like a good option would be to use <a href="https://github.com/substack/node-bigint" rel="nofollow noreferrer">node-bigint</a> as suggested by @RicardoTomasi.</p>
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    1. USAlec Wenzowski
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    1. COIf not, you can always build one. `:D`
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    2. COIf not, I most certainly intend to ;)
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    3. COJust make sure and release it for others. I imagine somewhere someone has done this (in the finance or trading industry), but it's probably proprietary.
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