while vs for_in

JavaScript performance comparison

Revision 3 of this test case created by 54yuri

Info

test "while" and "for in" speed when applying to list, the array number is more than "http://jsperf.com/for-vs-for-in"

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var l1 = [2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 7, 8, 9, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 3, 4, 5, 6, 1, 2, 3, 4, 5, 7, 8, 9, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 3, 4, 5, 6, 1, 2, 3, 4, 5, 7, 8, 9, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 3, 4, 5, 6, 1, 2, 3, 4, 5, 7, 8, 9, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1];
    var sum = 0;
  };
</script>

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Testing in unknown unknown
Test Ops/sec
test "for in"
 
for (var i in l1) {
  sum += l1[i];
}

 
 pending…
test while
 
var i = 0;
while (i < l1.length) {
  sum += l1[i++];
}
 pending…
test for
 
for(var i = 0; i < l1.length; i++) {
  sum += l1[i];
}
 pending…

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