query str parsing: regex vs split

JavaScript performance comparison

Revision 5 of this test case created by Pascal

Info

http://stevenbenner.com/2010/03/javascript-regex-trick-parse-a-query-string-into-an-object/

Preparation code

<script>
  var query = 'category=4&product_id=2140&query=lcd+tv&hello=world';

  function regex() {
    var queryString = {};
    query.replace(/([^?=&]+)(=([^&]*))?/g, function ($0, $1, $2, $3) {
      queryString[$1] = $3;
    });
 
    return queryString;
  }

  function splitWhile() {
      var i, item, parts, result;
      if (query == null) query = "";
      result = {};
      parts = query.split("&");
      i = parts.length;
      while (i--) {
        item = parts[i].split("=");
        result[item[0]] = item[1];
      }
      return result;
  };

  function splitFor() {
      var item, parts, result, _i, _len;
      if (query == null) query = "";
      result = {};
      parts = query.split("&");
      for (_i = 0, _len = parts.length; _i < _len; _i++) {
        item = parts[_i];
        item = item.split("=");
        result[item[0]] = item[1];
      }
      return result;
  };
</script>

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Testing in unknown unknown
Test Ops/sec
regex
regex()
pending…
split with for loop
splitFor()
pending…
split with while loop
splitWhile()
pending…

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