shift vs for loop

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var items = [];
    for (var i = 0; i < 100; i++) {
        items.push(i);
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
for loop
var len = items.length;
for(var i = 0; i < len; i++) {
    items[i];
}
pending…
shift
var i;
while ((i = items.shift()));
pending…
do-while
if (items.length > 0) {
  do {
   var i = items.shift();
  } while (items.length > 0);
}
pending…

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