Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var MAX_SIZE = 6;
    var a = [];
    var pos = 0;
  };
</script>

Test runner

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var a = [];
for (var i = 0; i < 100; ++i) {
  a.push(1);
  while (a.length > MAX_SIZE) {
    a.shift();
  }
}

var a = new Array(MAX_SIZE);
for (var i = 0; i < 100; ++i) {
  a[pos] = 1;
  pos = (pos + 1) % MAX_SIZE;
}

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