Javascript: Deep Comparison
<p>I was checking this question <a href="https://stackoverflow.com/questions/36783655/javascript-deep-comparison">Javascript Deep Comparison</a>
The solution of the question asker did not convince me so I tried to analyze the problem and came up with that</p>

<pre><code>var obj = {here: 2};
console.log(deepEqual(obj, obj));
// → true
console.log(deepEqual(obj, {here: 1}));
// → false
console.log(deepEqual(obj, {here: 2}));
// → true
function deepEqual(a,b)
{
  if( (typeof a == 'object' &amp;&amp; a != null) &amp;&amp;
      (typeof b == 'object' &amp;&amp; b != null) )
  {
     var count = [0,0];
     for( var key in a) count[0]++;
     for( var key in b) count[1]++;
     if( count[0]-count[1] != 0) {console.log('1');return false;}
     for( var key in a)
     {
       if(!(key in b) || !deepEqual(a[key],b[key])) {console.log('2');return false;}
     }
     for( var key in b)
     {
       if(!(key in a) || !deepEqual(b[key],a[key])) {console.log('3');return false;}
     }  
  }
  console.log('a:'+a+' b:'+b);
  return a===b;
}
obj === { here:2 }
</code></pre>

<p>This code fails the last test ( console.log(deepEqual(obj, {here: 2})) ) but the logic of considering objects deeply equal if they have respectively equal keys and values despite being different instances in memory does not convince me. Is there's a problem with my 'solution' or the mistake lies in the presumptions of the exercise? Is the code mentioned in the question I linked valid? </p>

<p>Resources that hikinthru forgot to mention ( <a href="http://eloquentjavascript.net/04_data.html#exercise_deep_compare" rel="noreferrer">http://eloquentjavascript.net/04_data.html#exercise_deep_compare</a> )</p>