checking array.length vs array[0]

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var buf = [], len = 1000;
   
    while (len--)
        buf.push(true);
};

Benchmark.prototype.teardown = function() {
    var buf = [], len = 1000;
   
    while (len--)
        buf.push(true);
};
</script>

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Testing in unknown unknown
Test Ops/sec
array.length
while (buf.length)
  buf.shift();
pending…
array[0]
while (buf[0])
  buf.shift();
pending…

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