long name on dom

JavaScript performance comparison

Test case created by

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

      
<script>
Benchmark.prototype.setup = function() {
  var id = 0;
  
  var expando = $.expando;
  var expando_short = $.fn.version + Math.floor(Math.random()*1000);
  var expando_shorter = "jQ" + $.fn.version;
  
  var div = document.createElement("div");

};
</script>

Preparation code output

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
long
id++;
div[expando + Math.random()] = 1
pending…
short
Math.random();
div[expando + id++] = 1
pending…
shorter
Math.random();
div[expando_short + id++] = 1
pending…
even shorter
Math.random();
div[expando_shorter + id++] = 1
pending…

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