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    <p>OK I found the answer: <a href="https://github.com/crcn/sift.js" rel="nofollow noreferrer">Sift.js</a></p> <p>Now for the long answer: This has been <a href="https://stackoverflow.com/questions/8695718/is-there-a-way-to-use-mongodb-query-objects-to-filter-regular-javascript-arrays">asked and answered before</a>. The salient points are:</p> <ul> <li>Use Sift if you really want Mongo syntax</li> <li>If you want to be more mainstream, use <a href="http://documentcloud.github.com/underscore/" rel="nofollow noreferrer">Underscore.js</a> like everyone else. It has heaps of handy functions in addition to the fact that it basically does what sift does with a slightly different syntax.</li> <li>You may not need any library at all - modern browsers support many useful functions directly on the <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/prototype" rel="nofollow noreferrer">Array prototype</a>, like <code>filter()</code> for example.</li> </ul> <p>As a final note, <a href="https://github.com/jostylr/mongodb-riff" rel="nofollow noreferrer">mongodb-riff</a> appears to be trying to do something similar but currently the page states clearly that it doesn't work - perhaps it's abandoned. But his readme is at least of value :-), he mentions sift and <a href="https://github.com/bevry/query-engine" rel="nofollow noreferrer">Query Engine</a> which looks more mature, though too complicated for me!</p> <p>Personally I'm going to go with Underscore because now that I've looked into it for the first time, I realise that it has heaps of handy stuff I need, plus I really only wanted to do simple functions like what would be <code>_.find()</code> in Underscore. But I guess if you want to do more complicated mongo-like queries, you'll do it in less LOC with Sift.</p>
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    1. POWhat Javascript library can evaluate MongoDB-like query predicates against an object?
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    1. POWhat Javascript library can evaluate MongoDB-like query predicates against an object?
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    1. COwell, i figured there'd be something - and why not on Github? i probably should have looked for myself, but i was hoping someone else had come across it already. let's see if you can steal the prize from @Vivin ^_^!
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    2. COawesome! [Sift.js](https://github.com/crcn/sift.js) looks just right. i do like and use [Underscore](http://underscorejs.org/)/[Lodash](http://lodash.com/), but need to re-use predicates already stored inside Mongo. thank you!
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    3. COoh, and thank you for finding [the original question](http://stackoverflow.com/questions/8695718]. i searched but didn't find it ^_^;
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