checking array.length vs array[0]

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    function rand(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
   
    var buf = [], len = 1e4;
   
    while (len--)
        buf.push(rand(0,9));
};

Benchmark.prototype.teardown = function() {
    var buf = [], len = 1e4;
   
    while (len--)
        buf.push(rand(0,9));
};
</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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