Cookie Parsing

JavaScript performance comparison

Revision 4 of this test case created by BrianMB

Info

Comparing two RegExp and String parsing methods for getting a value from a cookie.

Then adding in Lawnchair's cookie parser, for fun.

Preparation code

<script>
  var set = 'name2',
      cookie = 'name1=val1;name2=val2;name3=val3';
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
String
var setPos = cookie.indexOf(set + '='),
    stopPos = cookie.indexOf(';', setPos);
return !~setPos ? null : cookie.substring(
setPos, ~stopPos ? stopPos : undefined).split('=')[1];
pending…
RegExp (exec)
var regex = new RegExp(set + '=([^;]*)', 'g');
return regex.exec(cookie)[1] || null;
pending…
Lawnchair
var name = set;
var nameEQ = name + "=";
var ca = cookie.split(';');
var len = ca.length;
for (var i = 0; i < len; i++) {
 var c = ca[i];
 while (c.charAt(0) == ' ') c = c.substring(1, c.length);
 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
}
return null;
pending…
RegExp (match)
var val = cookie.match(set + '=([^;]*)') || null;
return val.length ? val[1] : val;
pending…

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