javascript - speed of setter functions not what expected -

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I am comparing the performance of two different types of sets as shown below: 

  Var q = {}; Var z = {}; (Function () {var x = 1; q.x = function () {return x;}; q.x.set = function (val) {x = val;};}) (); (Function () {var x = 1; z.x = function () {return x;}; z.x_set = function (val) {x = val;};}) ();   
 The difference is where the setter is stored:  q.x.set  vs  z.x_set . I hope that the  z  version to run faster because it needs to see a lower table contrast the  q  version is constantly fast, why any thoughts? Here's a few results:   
 
 
 There are some results from the different browsers of your experiment. Let's take a look at the results.  
 So we expect to be faster than  z  to  q . But when we examine the results, we see two different categories of results.  
     
  1.  The result is a little faster, moving towards  almost  similar,  q .  
  2.   OR   z  is quite fast. It tells me that it is on the mercy of the implementation of various JS engines. Various JS engines use a ton of low level adaptation, at the time of these very small atomic operations. Change the characteristics of Perhaps the  q  pattern triggers an optimization that is not in some browsers. Or maybe some browsers have optimization for the  z  pattern, which does not support older browsers. But given the lack of continuity, it is very difficult to answer  why .  
     One thing that clearly makes results, is that  is faster than   z   q . Sometimes  q  gets faster, but when  z  gets faster, then it is very fast.  
     chart!  
     
     But practically, the difference Is negligible. It is a small operation. Small changes in small operations can take major changes, which are in the perspective of one percent, but in a large application, there are very small changes in performance profiles. Personally, I think this is academically interesting, but there are very few real results.

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