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    <p>Ok, I'm seeing that quite a few people are interested in this so here's what I have up to now:</p> <pre><code>var filter = function(what,where) { var sameArrays = function(arr,arr1) { var al = arr.length, bl = arr1.length; if (al !== bl || al === 0 || bl === 0) { return; } for (var i = al - 1; i &gt;= 0; i--){ if (!match(arr[i], arr1[i])) { return; } } return arr1; }; var sameObjects = function(obj,obj1) { for (var i in obj) { if(!obj1.hasOwnProperty(i)){return;} if (!match(obj[i],obj1[i])) {return;} } return obj1; }; var inArray = function(value,obj) { var r = [], m = match; for (var i = obj.length - 1; i &gt;= 0; i--){ var item = obj[i]; if( m(value,item) ) { r.push( item ); } }; return (r.length) ? r : undefined ; }; var inObject = function(value,obj) { var r = [], m = match; for(var i in obj){ var item = obj[i]; if( m(value,item) ) { r.push( item ); } }; return (r.length) ? r : undefined ; }; var inString = function(value,string) { var valueConstructor = value.constructor; if( valueConstructor === RegExp) { return (value.test(string)) ? string : undefined ; } else if( valueConstructor === Function &amp;&amp; value(string) === true ) { return string; } }; var match = function(a,b) { if(typeof a === 'undefined' || typeof b === 'undefined' || a === null || b === null) { return; } if (a == b) { return b;} var vc = a.constructor, oc = b.constructor; // Cannot compare array or object to a string or a number if( (vc === Array || vc === Object) &amp;&amp; (oc === String || oc === Number) ) { return; } if( oc === Array &amp;&amp; vc === Array ) { return sameArrays(a,b); } else if(oc === Array) { return inArray(a,b); } else if (oc === Object &amp;&amp; vc === Object) { return sameObjects(a,b); } else if (oc === Object) { return inObject(a,b); } else if (vc === Object || vc === Array) { return; } else if (oc === String || oc === Number){ return inString(a,b); } }; return match(what,where); }; </code></pre> <p>Which allows you do the following:</p> <pre><code>var b = [ { 'name' : 'some name', age: 23, id: 0, 'has' : ['dogs'] }, { 'name' : 'some name 2', age:24, id: 1, 'has' : ['dogs', 'cats'] }, { 'name' : 'some name 3', age: 25, id: 2 , 'has' : ['donkeys', 'goats']}, { 'name' : 'some name 4', age:26, id: 3, 'has' : ['parrots', 'treasure'] }, { 'name' : 'some name 5', age:27, id: 4, 'has' : undefined } ]; filter({ age:23 },b) filter({ age:'24' },b) filter({ name: /\d$/ },b) filter('dogs',b) filter({ has: 'goats' },b) </code></pre> <p>This is part of some sort of js library that I've been working on, so if you find working with json + dom try searching google code for <strong>jdatastore</strong>.</p>
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    1. POIn javascript, how would you build a method that compares value A with value B
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    1. USNicolas R
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