for loop if oh yeah

JavaScript performance comparison

Test case created by jack

Preparation code

<div id='a'></div>
<div id='b'></div>
<div id='c'></div>
<div id='d'></div>
<div id='e'></div>
<div id='f'></div>
<div id='g'></div>
<div id='h'></div>
<div id='i'></div>
<div id='j'></div>
<div id='k'></div>
<script>
Benchmark.prototype.setup = function() {
    var q = {
      a : true,
      b : true,
      c : false,
      d : true,
      e : false,
      f : false,
      g : true,
      h : true,
      i : false,
      j : false,
      k : false
    }
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
for loop
for(var i in q){
  if(q[i]) document.getElementById(i).className += q[i];
}
pending…
bunch of ifs
if(q.a) document.getElementById('a').className += 'true';
if(q.b) document.getElementById('b').className += 'true';
if(q.c) document.getElementById('c').className += 'true';
if(q.d) document.getElementById('d').className += 'true';
if(q.e) document.getElementById('e').className += 'true';
if(q.f) document.getElementById('f').className += 'true';
if(q.g) document.getElementById('g').className += 'true';
if(q.h) document.getElementById('h').className += 'true';
if(q.i) document.getElementById('i').className += 'true';
if(q.j) document.getElementById('j').className += 'true';
if(q.k) document.getElementById('k').className += 'true';
pending…

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