Comparison of property lookup approaches

JavaScript performance comparison

Test case created by Addy Osmani

Preparation code

<script>
  /*just a sample function so we have something custom properties can be attached to*/
  function getValue(value){
    return value;
  }
 
  var cache = {};
  getValue.cache = {};
 
</script>

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Testing in unknown unknown
Test Ops/sec
Custom function property
getValue.prop = 5;
getValue(getValue.prop); //lookup
pending…
Separate variable
cache.prop = 5;
getValue(cache.prop);
pending…

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