grep vs pure js

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
  Benchmark.prototype.setup = function() {
    var me = {boards: [{id: 1}, {id:2}, {id:3}, {id:4}, {id:5}, {id:6}, {id:7}, {id:8}, {id:9}, {id:10}]};
    
    var id = 10;
    
    function cond(e){return e.id == id}
    
    Array.prototype.filter1 = function(fun /*, thisp */)
      {
        "use strict";
     
        if (this == null)
          throw new TypeError();
     
        var t = Object(this);
        var len = t.length >>> 0;
        if (typeof fun != "function")
          throw new TypeError();
     
        var res = [];
        var thisp = arguments[1];
        for (var i = 0; i < len; i++)
        {
          if (i in t)
          {
            var val = t[i]; // in case fun mutates this
            if (fun.call(thisp, val, i, t))
              res.push(val);
          }
        }
     
        return res;
      };
  };
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
 
$.grep(me.boards, cond);
 
 pending…
JS
 
me.boards.filter1(cond);
 pending…
native Array.filter
 
me.boards.filter(cond);
 
 pending…

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