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    <p>Node has the built in <a href="http://nodejs.org/api/assert.html">assert</a> module meant for testing. This has a method called <em>deepEqual</em> for deep equality checking.</p> <p>Function signature is:</p> <pre><code>assert.deepEqual(actual, expected, [message]) </code></pre> <p>Quickly written function for testing deepEquality and returning diff:</p> <pre><code>// Will test own properties only function deepEqualWithDiff(a, e, names){ var dif = {}; var aKeys = Object.keys(a); var eKeys = Object.keys(e); var cKeys = aKeys; var dKeys = eKeys; var c = a; var d = e; var names = { c: names ? names['a'] : 'Actual', d: names ? names['e'] : 'Expected' } if(eKeys.length &gt; aKeys.length){ cKeys = eKeys; dKeys = aKeys; c = e; d = a; names = { d: names ? names['a'] : 'Actual', c: names ? names['e'] : 'Expected' } } for(var i = 0, co = cKeys.length; i &lt; co; i++){ var key = cKeys[i]; if(typeof c[key] !== typeof d[key]){ dif[key] = 'Type mismatch ' + names['c'] + ':' + typeof c[key] + '!==' + names['d'] + typeof d[key]; continue; } if(typeof c[key] === 'function'){ if(c[key].toString() !== d[key].toString()){ dif[key] = 'Differing functions'; } continue; } if(typeof c[key] === 'object'){ if(c[key].length !== undefined){ // array var temp = c[key].slice(0); temp = temp.filter(function(el){ return (d[key].indexOf(el) === -1); }); var message = ''; if(temp.length &gt; 0){ message += names['c'] + ' excess ' + JSON.stringify(temp); } temp = d[key].slice(0); temp = temp.filter(function(el){ return (c[key].indexOf(el) === -1); }); if(temp.length &gt; 0){ message += ' and ' + names['d'] + ' excess ' + JSON.stringify(temp); } if(message !== ''){ dif[key] = message; } continue; } var diff = deepEqualWithDiff(c[key], d[key], {a:names['c'],e:names['d']}); if(diff !== true &amp;&amp; Object.keys(diff).length &gt; 0){ dif[key] = diff; } continue; } // Simple types left so if(c[key] !== d[key]){ dif[key] = names['c'] + ':' + c[key] + ' !== ' + names['d'] + ':' + d[key]; } } return Object.keys(dif).length &gt; 0 ? dif : true; } </code></pre>
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    1. POTesting objects equality in NodeJS
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    1. USDeadAlready
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    1. VO
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    2. VO
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    1. COThat's really not we're looking for, because it just indicates that the 2 objects are not equal... but fails to tell us what's different!
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      1. USJulien Genestoux
 

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